Fix parsing error in rulecheck-tests job of sast-rules

What does this MR do?

Fixes error in rule rules/lgpl-cc/java/endpoint/rule-ManuallyConstructedURLs.java

What are the relevant issue numbers?

Fix parsing error in rulecheck-tests job of sas... (gitlab-org/gitlab#459024 - closed) • Bhavya Kaushal • 17.1

Does this MR meet the acceptance criteria?

• The test cases cover both positive and negative cases and are also annotated with appropriate semgrep annotations:
  • For positive cases: // ruleid: ...
  • For negative cases: // ok: ....
• Following metadata fields exist for the rule(s) added/updated in this MR:
  • owasp with both 2017 and 2021 mappings.
  • category: "security"
  • cwe
  • shortDescription
  • security-severity
• The message field is valid and contains a secure code example.
• Applicable license is mentioned in the rule if embedded/taken from external source.
• Relevant labels including workflow labels are appropriately selected.