StripSpaces: only strip spaces

StripWhitespace maintains old behavior

Source/Core/InputCommon/ControlReference/ExpressionParser.cpp

@@ -980,7 +980,7 @@ static std::unique_ptr<Expression> ParseBarewordExpression(const std::string& st
 
 ParseResult ParseExpression(const std::string& str)
 {
-  if (StripSpaces(str).empty())
+  if (StripWhitespace(str).empty())
     return ParseResult::MakeEmptyResult();
 
   auto bareword_expr = ParseBarewordExpression(str);