Remove bool CardInstance::hasSubtype(const char * _subtype)

There exists bool CardInstance::hasSubtype(const string& _subtype) and the
const char* version converts _subtype into string deeper in the call
hierarchy anyway. So both methods did the same.

projects/mtg/src/CardPrimitive.cpp

@@ -350,12 +350,6 @@ bool CardPrimitive::hasType(const char * _type)
     return hasType(id);
 }
 
-bool CardPrimitive::hasSubtype(const char * _subtype)
-{
-    int id = MTGAllCards::findType(_subtype);
-    return hasType(id);
-}
-
 bool CardPrimitive::hasSubtype(const string& _subtype)
 {
     int id = MTGAllCards::findType(_subtype);