patch 9.0.0206: redraw flags are not named specifically

Problem:    Redraw flags are not named specifically.
Solution:   Prefix "UPD_" to the flags, for UPDate_screen().
diff --git a/src/match.c b/src/match.c
index e58ad01..335b060 100644
--- a/src/match.c
+++ b/src/match.c
@@ -39,7 +39,7 @@
     matchitem_T	*m;
     int		hlg_id;
     regprog_T	*regprog = NULL;
-    int		rtype = SOME_VALID;
+    int		rtype = UPD_SOME_VALID;
 
     if (*grp == NUL || (pat != NULL && *pat == NUL))
 	return -1;
@@ -192,7 +192,7 @@
 	    }
 	    m->pos.toplnum = toplnum;
 	    m->pos.botlnum = botlnum;
-	    rtype = VALID;
+	    rtype = UPD_VALID;
 	}
     }
 
@@ -228,7 +228,7 @@
 {
     matchitem_T	*cur = wp->w_match_head;
     matchitem_T	*prev = cur;
-    int		rtype = SOME_VALID;
+    int		rtype = UPD_SOME_VALID;
 
     if (id < 1)
     {
@@ -269,7 +269,7 @@
 	    wp->w_buffer->b_mod_bot = cur->pos.botlnum;
 	    wp->w_buffer->b_mod_xlines = 0;
 	}
-	rtype = VALID;
+	rtype = UPD_VALID;
     }
     vim_free(cur);
     redraw_win_later(wp, rtype);
@@ -292,7 +292,7 @@
 	vim_free(wp->w_match_head);
 	wp->w_match_head = m;
     }
-    redraw_win_later(wp, SOME_VALID);
+    redraw_win_later(wp, UPD_SOME_VALID);
 }
 
 /*