Fix CI: unmatchedSuppression in simplecpp.cpp (#8589)

Author: chrchr-github

.selfcheck_suppressions

@@ -76,7 +76,6 @@ funcArgNamesDifferentUnnamed:externals/tinyxml2/tinyxml2.h
 nullPointerRedundantCheck:externals/tinyxml2/tinyxml2.cpp
 knownConditionTrueFalse:externals/tinyxml2/tinyxml2.cpp
 useStlAlgorithm:externals/simplecpp/simplecpp.cpp
-knownConditionTrueFalse:externals/simplecpp/simplecpp.cpp
 funcArgNamesDifferentUnnamed:externals/simplecpp/simplecpp.h
 missingMemberCopy:externals/simplecpp/simplecpp.h
 shadowFunction:externals/simplecpp/simplecpp.h