Fix wrong entries in the space indexes in posixfs

[aduffeck]

Fixes opencloud-eu/opencloud#304

[butonic]

hm, make test fails:

• [FAILED] [0.011 seconds]
Spaces Create Space during login [It] space is created
/home/jfd/Repositories/reva/pkg/storage/pkg/decomposedfs/spaces_test.go:78

  [FAILED] Expected
      <int>: 0
  to equal
      <int>: 1
  In [It] at: /home/jfd/Repositories/reva/pkg/storage/pkg/decomposedfs/spaces_test.go:81 @ 03/12/25 10:10:43.394
------------------------------
•••••
------------------------------
• [FAILED] [0.013 seconds]
Spaces Create Space can delete homespace [It] fails on trying to delete a homespace as non-admin
/home/jfd/Repositories/reva/pkg/storage/pkg/decomposedfs/spaces_test.go:122

  [FAILED] Expected
      <int>: 0
  to equal
      <int>: 1
  In [It] at: /home/jfd/Repositories/reva/pkg/storage/pkg/decomposedfs/spaces_test.go:126 @ 03/12/25 10:10:43.457
------------------------------
• [FAILED] [0.012 seconds]
Spaces Create Space can delete homespace [It] succeeds on trying to delete homespace as user with 'delete-all-home-spaces' permission
/home/jfd/Repositories/reva/pkg/storage/pkg/decomposedfs/spaces_test.go:135

  [FAILED] Expected
      <int>: 0
  to equal
      <int>: 1
  In [It] at: /home/jfd/Repositories/reva/pkg/storage/pkg/decomposedfs/spaces_test.go:139 @ 03/12/25 10:10:43.471
------------------------------
• [FAILED] [0.013 seconds]
Spaces Create Space can delete homespace [It] fails on trying to delete homespace as user with 'delete-all-spaces' permission
/home/jfd/Repositories/reva/pkg/storage/pkg/decomposedfs/spaces_test.go:148

  [FAILED] Expected
      <int>: 0
  to equal
      <int>: 1
  In [It] at: /home/jfd/Repositories/reva/pkg/storage/pkg/decomposedfs/spaces_test.go:152 @ 03/12/25 10:10:43.484
------------------------------
••••
------------------------------
• [FAILED] [0.019 seconds]
Spaces Create Space Create Spaces with custom alias template during login [It] personal space is created with custom alias
/home/jfd/Repositories/reva/pkg/storage/pkg/decomposedfs/spaces_test.go:234

  [FAILED] Expected
      <int>: 0
  to equal
      <int>: 1
  In [It] at: /home/jfd/Repositories/reva/pkg/storage/pkg/decomposedfs/spaces_test.go:237 @ 03/12/25 10:10:43.564
------------------------------
•••••••••••••••••••••••••••••••••

Summarizing 5 Failures:
  [FAIL] Spaces Create Space during login [It] space is created
  /home/jfd/Repositories/reva/pkg/storage/pkg/decomposedfs/spaces_test.go:81
  [FAIL] Spaces Create Space can delete homespace [It] fails on trying to delete a homespace as non-admin
  /home/jfd/Repositories/reva/pkg/storage/pkg/decomposedfs/spaces_test.go:126
  [FAIL] Spaces Create Space can delete homespace [It] succeeds on trying to delete homespace as user with 'delete-all-home-spaces' permission
  /home/jfd/Repositories/reva/pkg/storage/pkg/decomposedfs/spaces_test.go:139
  [FAIL] Spaces Create Space can delete homespace [It] fails on trying to delete homespace as user with 'delete-all-spaces' permission
  /home/jfd/Repositories/reva/pkg/storage/pkg/decomposedfs/spaces_test.go:152
  [FAIL] Spaces Create Space Create Spaces with custom alias template during login [It] personal space is created with custom alias
  /home/jfd/Repositories/reva/pkg/storage/pkg/decomposedfs/spaces_test.go:237

Ran 82 of 83 Specs in 1.480 seconds
FAIL! -- 77 Passed | 5 Failed | 1 Pending | 0 Skipped