Make hidden tags behave identically (#1847)

Add both `[.]` and `[!hide]` tags when registering a hidden test case, as per documentation.

Co-authored-by: Martin Hořeňovský <martin.horenovsky@gmail.com>

include/internal/catch_test_case_info.cpp

@@ -89,7 +89,8 @@ namespace Catch {
             }
         }
         if( isHidden ) {
-            tags.emplace_back( "." );
+            // Add all "hidden" tags to make them behave identically
+            tags.insert( tags.end(), { ".", "!hide" } );
         }
 
         TestCaseInfo info( static_cast<std::string>(nameAndTags.name), _className, desc, tags, _lineInfo );