Remove redundant _signalPatched reset in isolate functions

Eliminated unnecessary assignments to _signalPatched in _ensurePythonIsolate and _restartPythonIsolate, as the variable is not required to be reset in these contexts.

Author: FeodorFitsner

src/serious_python_android/lib/src/cpython.dart

@@ -38,8 +38,8 @@ Future<String> runPythonProgramFFI(bool sync, String dynamicLibPath,
   await _ensurePythonIsolate();
 
   final response = ReceivePort();
-  _pythonSendPort!.send(
-      [response.sendPort, dynamicLibPath, pythonProgramPath, script]);
+  _pythonSendPort!
+      .send([response.sendPort, dynamicLibPath, pythonProgramPath, script]);
   try {
     final result = await response.first
         .timeout(_pythonRunTimeout, onTimeout: () => "<timeout>");
@@ -88,15 +88,13 @@ Future<void> _ensurePythonIsolate() async {
   _pythonIsolate = await Isolate.spawn(_pythonIsolateMain, readyPort.sendPort);
   _pythonSendPort = await readyPort.first as SendPort;
   readyPort.close();
-  _signalPatched = false;
 }
 
 void _restartPythonIsolate() {
   _pyLog("restarting Python isolate");
   _pythonIsolate?.kill(priority: Isolate.immediate);
   _pythonIsolate = null;
   _pythonSendPort = null;
-  _signalPatched = false;
 }
 
 Future<String> runPythonProgramInIsolate(List<Object> arguments) async {