[clang-tidy] Hotfix default parameter value in 'bugprone-easily-swappable-parameters'

As identified by @RKSimon, there was a missing comma in the default
value for the "ignored parameter type suffixes" array, resulting in
bogus concatenation of two elements.

clang-tools-extra/clang-tidy/bugprone/EasilySwappableParametersCheck.cpp

@@ -56,7 +56,7 @@ static const std::string DefaultIgnoredParameterTypeSuffixes =
                                    "reverse_const_iterator",
                                    "ConstReverseIterator",
                                    "Const_Reverse_Iterator",
-                                   "const_reverse_iterator"
+                                   "const_reverse_iterator",
                                    "Constreverseiterator",
                                    "constreverseiterator"});