Cherry-pick #24152 to 7.12: indicator type url is in upper case

[P1llus]

Cherry-pick of PR #24152 to 7.12 branch. Original message:

What does this PR do?

Small fix to OTX url indicators for the new TI module

Why is it important?

Small fix to OTX url indicators for the new TI module

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

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Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

[elasticmachine]

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Build stats

• Build Cause: Pull request #24154 opened

• Start Time: 2021-02-22T10:25:44.592+0000

• Duration: 46 min 44 sec

• Commit: 6c4b902

Test stats 🧪

Test	Results
Failed	0
Passed	6813
Skipped	1153
Total	7966

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Test stats 🧪

Test	Results
Failed	0
Passed	6813
Skipped	1153
Total	7966