patch 8.2.4745: using wrong flag for using bell in the terminal

Problem:    Using wrong flag for using bell in the terminal.
Solution:   Change to use BO_TERM.

src/misc1.c

@@ -1095,11 +1095,10 @@ beep_flush(void)
 }
 
 /*
- * Give a warning for an error.
+ * Give a warning for an error. "val" is one of the BO_ values, e.g., BO_OPER.
  */
     void
-vim_beep(
-    unsigned val) // one of the BO_ values, e.g., BO_OPER
+vim_beep(unsigned val)
 {
 #ifdef FEAT_EVAL
     called_vim_beep = TRUE;