Cosmetic change to wxTestingModalHook error message.

Don't include the word "dialog" in it, by default the description is just the
class name and so typically already includes "dialog" in it, e.g. we could
have "Expected wxFileDialog dialog" which was redundant.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@78414 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/testing.h

@@ -289,7 +289,7 @@ public:
             (
                 wxString::Format
                 (
-                    "Expected %s dialog was not shown.",
+                    "Expected %s was not shown.",
                     expect->GetDescription()
                 )
             );