[RELEASE-7.4] Correct the flags used for opening the encryption key file

[johscheuer]

Backport: #12220

Without this change the fdbbackup binary will fail to load encryption keys that are stored in tmpfs because O_DIRCET is used.

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[foundationdb-ci]

Result of foundationdb-pr-macos-m1 on macOS Ventura 13.x

• Commit ID: 621f042
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[foundationdb-ci]

Result of foundationdb-pr-clang-arm on Linux CentOS 7

• Commit ID: 621f042
• Duration 0:48:12
• Result: ✅ SUCCEEDED
• Error: N/A
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[foundationdb-ci]

Result of foundationdb-pr-macos on macOS Ventura 13.x

• Commit ID: 621f042
• Duration 1:05:44
• Result: ✅ SUCCEEDED
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[foundationdb-ci]

Result of foundationdb-pr-cluster-tests on Linux RHEL 9

• Commit ID: 621f042
• Duration 1:09:12
• Result: ✅ SUCCEEDED
• Error: N/A
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[foundationdb-ci]

Result of foundationdb-pr-clang on Linux RHEL 9

• Commit ID: 621f042
• Duration 3:00:15
• Result: ❌ FAILED
• Error: Build has timed out.
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[foundationdb-ci]

Result of foundationdb-pr on Linux RHEL 9

• Commit ID: 621f042
• Duration 3:00:15
• Result: ❌ FAILED
• Error: Build has timed out.
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[spraza]

LGTM

[foundationdb-ci]

Result of foundationdb-pr-clang-arm on Linux CentOS 7

• Commit ID: 621f042
• Duration 0:48:30
• Result: ✅ SUCCEEDED
• Error: N/A
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[foundationdb-ci]

Result of foundationdb-pr-clang on Linux RHEL 9

• Commit ID: 621f042
• Duration 1:01:16
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• Error: N/A
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[foundationdb-ci]

Result of foundationdb-pr on Linux RHEL 9

• Commit ID: 621f042
• Duration 1:04:59
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• Error: N/A
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[foundationdb-ci]

Result of foundationdb-pr-cluster-tests on Linux RHEL 9

• Commit ID: 621f042
• Duration 1:15:47
• Result: ✅ SUCCEEDED
• Error: N/A
• Build Log terminal output (available for 30 days)
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