Fix wxExecute() tests exclusion in cross-MSW CI job

It would be good to find out which test exactly hangs and, ideally,
understand why does it happen but for now just exclude them as we did
before the CppUnit cleanup in the test.

.github/workflows/ci_msw_cross.yml

@@ -245,7 +245,7 @@ jobs:
           excluded_tests+=('~wxFileSystemWatcher::EventCreate')
 
           # The test fails (even with wxTEST_RUNNER-related changes) and hangs.
-          excluded_tests+=('~ExecTestCase')
+          excluded_tests+=('~[exec]')
 
           # Wine WinHTTP implementations seems buggy, there are many errors.
           excluded_tests+=('~[webrequest]')
@@ -265,7 +265,7 @@ jobs:
           excluded_gui_tests+=('~ComboBoxTestCase') # TextChangeEvents
           excluded_gui_tests+=('~DatePickerCtrlTestCase') # Range
           excluded_gui_tests+=('~wxEnhMetaFileDC::GetTextExtent')
-          excluded_gui_tests+=('~ExecTestCase')
+          excluded_gui_tests+=('~[exec]')
           excluded_gui_tests+=('~wxFont::GetSet')
           excluded_gui_tests+=('~GraphicsPathTestCaseGDIPlus')
           excluded_gui_tests+=('~ImageList*')