Fixes #25360: Search for pythonw.exe when in pyw.exe.

PC/launcher.c

@@ -1254,7 +1254,7 @@ path '%ls'", command);
                              * is no version specification.
                              */
                             debug(L"searching PATH for python executable\n");
-                            cmd = find_on_path(L"python");
+                            cmd = find_on_path(PYTHON_EXECUTABLE);
                             debug(L"Python on path: %ls\n", cmd ? cmd->value : L"<not found>");
                             if (cmd) {
                                 debug(L"located python on PATH: %ls\n", cmd->value);