Fix spinning in Welcome page

[betodealmeida]

SUMMARY

The SavedQuery model has a url attribute that is a method, not a property. This causes requests to tagview/tagged_objects to fail.

TEST PLAN

Welcome page now loads correctly when user had saved queries.

ADDITIONAL INFORMATION

[ ] Has associated issue:
[ ] Changes UI
[ ] Requires DB Migration. Confirm DB Migration upgrade and downgrade tested.
[ ] Introduces new feature or API
[ ] Removes existing feature or API
[x] Fixes bug
[ ] Refactors code
[ ] Adds test(s)

REVIEWERS

@xtinec @datability-io @khtruong

[Alagappan]

👍

[khtruong]

+1

[codecov-io]

Codecov Report

Merging #7247 into lyftga will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           lyftga    #7247   +/-   ##
=======================================
  Coverage   64.53%   64.53%           
=======================================
  Files         425      425           
  Lines       20861    20861           
  Branches     2280     2280           
=======================================
  Hits        13463    13463           
  Misses       7272     7272           
  Partials      126      126

Impacted Files	Coverage Δ
superset/views/tags.py	42.5% <ø> (ø)	⬆️

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