cppcheck: Fix "condition is always true" warning.

The chain of if clauses has already tested and handled the cases where
"thisScore" is negative and zero, therefore there is no need to test
for a positive value.

mythtv/programs/mythcommflag/ClassicCommDetector.cpp

@@ -1737,8 +1737,8 @@ void ClassicCommDetector::BuildAllMethodsCommList(void)
                 }
             }
         }
-        else if ((thisScore > 0) &&
-                 (lastScore < 0) &&
+        // thisScore > 0
+        else if ((lastScore < 0) &&
                  (breakStart != -1))
         {
             if (((fbp->start - breakStart) >