syncqt: remove unnecessary check for not empty string

The previous if checks it.

Change-Id: I03321da3d6886e1788ad48433d451a5cc643f8dd
Reviewed-by: Marc Mutz <marc.mutz@qt.io>
Reviewed-by: Alexey Edelev <alexey.edelev@qt.io>

src/tools/syncqt/main.cpp

@@ -303,7 +303,7 @@ private:
             if (arg.empty())
                 continue;
 
-            if (arg.size() > 0 && arg[0] == '-') {
+            if (arg[0] == '-') {
                 currentValue = nullptr;
                 currentListValue = nullptr;
                 {