Remove unused function entityclass::confirmflags()

Same as before, flags can never be the number 2, and never could be even
before I changed all flags to be bools. Also this function is unused.

desktop_version/src/Entity.h

@@ -28,8 +28,6 @@ public:
 
     void resetallflags();
 
-    void confirmflags();
-
     void fatal_top()
     {
         createblock(DAMAGE, -8, -8, 384, 16);