patch 8.2.0774: t_TI and t_TE are output when using 'visualbell'

Problem:    t_TI and t_TE are output when using 'visualbell'. (Dominique
            Pelle)
Solution:   Do not change the terminal mode for a short sleep.  Do not output
            t_TI and t_TE when switching to/from TMODE_SLEEP. Make tmode an
            enum.
diff --git a/src/proto/os_mswin.pro b/src/proto/os_mswin.pro
index ade7cc2..e8a6cb9 100644
--- a/src/proto/os_mswin.pro
+++ b/src/proto/os_mswin.pro
@@ -10,7 +10,7 @@
 int mch_isFullName(char_u *fname);
 void slash_adjust(char_u *p);
 int vim_stat(const char *name, stat_T *stp);
-void mch_settmode(int tmode);
+void mch_settmode(tmode_T tmode);
 int mch_get_shellsize(void);
 void mch_set_shellsize(void);
 void mch_new_shellsize(void);