Fix a case where a boolean check (vector.empty()) was used when a clear (vector.clear()) was intended in ExpressionParser.cpp.

Source/Core/InputCommon/Src/ControllerInterface/ExpressionParser.cpp

@@ -190,7 +190,7 @@ public:
 
 			if (tok.type == TOK_INVALID)
 			{
-				tokens.empty();
+				tokens.clear();
 				return EXPRESSION_PARSE_SYNTAX_ERROR;
 			}