Make test stricter (these strings appear in function pointer arguments)

Author: adrian-prantl

lldb/test/API/lang/swift/async/unwind/hidden_frames/TestSwiftAsyncHiddenFrames.py

@@ -23,6 +23,6 @@ def test(self):
             "frame.*Main.main"
         ])
         self.expect("thread backtrace", matching=False, patterns=[
-            "frame.*partial apply",
+            "frame[^(]*partial apply",
             "frame.*back deployment fallback"
         ])