Value accuracy of mouse_enabled global variable.

Signed-off-by: Andrew Borodin <aborodin@vmail.ru>

lib/tty/mouse.c

@@ -121,7 +121,7 @@ enable_mouse (void)
                 use_mouse_p = MOUSE_NONE;
                 return;
             }
-            mouse_enabled = 1;
+            mouse_enabled = TRUE;
         }
         break;
 #endif /* HAVE_LIBGPM */