Fix bug where single pattern property objects did not honor strictIndexSignatures

Signed-off-by: Yoriyasu Yano <[email protected]>

Author: yorinasub17

src/parser.ts

@@ -416,6 +416,7 @@ function parseSchema(
         const comment = `This interface was referenced by \`${parentSchemaName}\`'s JSON-Schema definition
 via the \`patternProperty\` "${key}".`
         ast.comment = ast.comment ? `${ast.comment}\n\n${comment}` : comment
+        ast.keyName = singlePatternProperty ? '[k: string]' : key
         return {
           ast,
           isPatternProperty: !singlePatternProperty,