patch 8.2.4709: after :redraw the statusline highlight might be used

Problem:    After :redraw the statusline highlight might be used.
Solution:   Clear the screen attribute after redrawing the screen.
            (closes #10108)
diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index 90ca7ad..0b88259 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -8290,6 +8290,9 @@
     RedrawingDisabled = r;
     p_lz = p;
 
+    // After drawing the statusline screen_attr may still be set.
+    screen_stop_highlight();
+
     // Reset msg_didout, so that a message that's there is overwritten.
     msg_didout = FALSE;
     msg_col = 0;