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/spellfile.c b/src/spellfile.c
index 8120d75..5962a10 100644
--- a/src/spellfile.c
+++ b/src/spellfile.c
@@ -1759,7 +1759,7 @@
 	    if (spell_load_file(fname, NULL, slang, FALSE) == NULL)
 		// reloading failed, clear the language
 		slang_clear(slang);
-	    redraw_all_later(SOME_VALID);
+	    redraw_all_later(UPD_SOME_VALID);
 	    didit = TRUE;
 	}
     }
@@ -6367,7 +6367,7 @@
 	if (buf != NULL)
 	    buf_reload(buf, buf->b_orig_mode, FALSE);
 
-	redraw_all_later(SOME_VALID);
+	redraw_all_later(UPD_SOME_VALID);
     }
     vim_free(fnamebuf);
 }