Allow, and even require, semicolon after wxTEST_DIALOG() macro

This macro was documented (in its comment) and even used with a
semicolon after it, but it didn't require one and using one after it
resulted in a warning with gcc in pedantic mode.

Change the macro definition to use wxSTATEMENT_MACRO_BEGIN/END to
require (and, trivially, also allow to be used without warnings) a
semicolon after it now.

docs/changes.txt

@@ -91,6 +91,9 @@ Changes in behaviour which may result in build errors
   options was completely removed. Please use address sanitizer or similar
   tools that are incomparably more useful for this than that legacy code.
 
+- wxTEST_DIALOG() macro now must be followed by semicolon, whereas previously
+  it was only supposed to, but it wasn't mandatory to use one after it.
+
 
 3.3.0: (released 2022-??-??)
 ----------------------------

include/wx/testing.h

@@ -516,12 +516,13 @@ private:
           method.
  */
 #define wxTEST_DIALOG(codeToRun, ...)                                          \
-    {                                                                          \
+    wxSTATEMENT_MACRO_BEGIN                                                    \
         wxTEST_DIALOG_HOOK_CLASS wx_hook(__FILE__, __LINE__, __func__);        \
         wxCALL_FOR_EACH(WX_TEST_IMPL_ADD_EXPECTATION, __VA_ARGS__)             \
         codeToRun;                                                             \
         wx_hook.CheckUnmetExpectations();                                      \
-    }
+    wxSTATEMENT_MACRO_END
+
 
 #endif // !WXBUILDING