fixup! ABI coder v1 deprecation warning

Author: matheusaaguiar

libsolidity/analysis/SyntaxChecker.cpp

@@ -150,7 +150,7 @@ bool SyntaxChecker::visit(PragmaDirective const& _pragma)
 		else
 			m_sourceUnit->annotation().useABICoderV2 = (_pragma.literals()[1] == "v2");
 
-		if (_pragma.literals().size() > 1 && _pragma.literals()[1] == "v1")
+		if (!*m_sourceUnit->annotation().useABICoderV2)
 			m_errorReporter.warning(
 				9511_error,
 				_pragma.location(),