patch 8.2.4610: some conditions are always true

Problem:    Some conditions are always true.
Solution:   Remove the useless conditions. (closes #9993)
diff --git a/src/drawline.c b/src/drawline.c
index d8b7c4a..747a1e3 100644
--- a/src/drawline.c
+++ b/src/drawline.c
@@ -1226,8 +1226,7 @@
 	    {
 		draw_state = WL_BRI;
 		// if need_showbreak is set, breakindent also applies
-		if (wp->w_p_bri && n_extra == 0
-					 && (row != startrow || need_showbreak)
+		if (wp->w_p_bri && (row != startrow || need_showbreak)
 # ifdef FEAT_DIFF
 			&& filler_lines == 0
 # endif