fix: Add missing keywords threshold in linter test

TypeScript build was failing due to incomplete thresholds object.
The LintConfig type requires both size and keywords thresholds,
but the test was only providing size.

Fixed by adding the missing keywords.minAccuracy property.

Author: d3xter666

plugins/ui5/skill-lint/tests/core/linter.test.ts

@@ -196,6 +196,9 @@ describe('SkillLinter', () => {
           size: {
             maxLines: 1,
             maxTokens: 10,
+          },
+          keywords: {
+            minAccuracy: 90,
           }
         }
       });