Fix conveyor check in collisioncheck() always being true

cppcheck said: "Logical disjunction always evaluates to true".

Yes. Yes it does. Whoops. I learned how to specify ranges like this in
high school math and still screw it up...

desktop_version/src/Entity.cpp

@@ -4674,7 +4674,7 @@ void entityclass::collisioncheck(int i, int j, bool scm /*= false*/)
         }
         break;
     case 2:   //Moving platforms
-        if (entities[j].behave >= 8 || entities[j].behave < 10)
+        if (entities[j].behave >= 8 && entities[j].behave < 10)
         {
             //We don't want conveyors, moving platforms only
             break;