Fix parameter mode conversion: convert ALL FUNC_PARAM_IN to FUNC_PARAM_DEFAULT

Major improvement in 13-14 transformer test pass rate:
- Before: 35 failed, 223 passed (86.4%)
- After: 17 failed, 241 passed (93.4%)
- Reduced failing tests by nearly 50%

Fixed parameter mode conversion logic to match V14 parser behavior:
- V14 parser converts ALL FUNC_PARAM_IN parameters to FUNC_PARAM_DEFAULT
- Both named and unnamed parameters are converted consistently
- Remaining failures are mostly syntax errors and context-specific edge cases

Co-Authored-By: Dan Lynch <[email protected]>

Author: devin-ai-integration[bot]

packages/transform/src/transformers/v13-to-v14.ts

@@ -3194,7 +3194,7 @@ export class V13ToV14Transformer {
         }
         return 'FUNC_PARAM_VARIADIC';
       case 'FUNC_PARAM_IN':
-        return 'FUNC_PARAM_IN';
+        return 'FUNC_PARAM_DEFAULT';
       default:
         return pg13Mode;
     }