Fix nit formatting

Author: rchamala

lldb/test/API/functionalities/scripted_process/stack_core_scripted_process.py

@@ -223,9 +223,9 @@ def get_stop_reason(self) -> Dict[str, Any]:
             if self.is_stopped:
                 if "arm64" in self.scripted_process.arch:
                     stop_reason["type"] = lldb.eStopReasonException
-                    stop_reason["data"]["desc"] = (
-                        self.corefile_thread.GetStopDescription(100)
-                    )
+                    stop_reason["data"][
+                        "desc"
+                    ] = self.corefile_thread.GetStopDescription(100)
                 elif self.scripted_process.arch == "x86_64":
                     stop_reason["type"] = lldb.eStopReasonSignal
                     stop_reason["data"]["signal"] = signal.SIGTRAP