patch 8.2.1221: memory leak when updating popup window

Problem:    Memory leak when updating popup window.
Solution:   Clear search highlighting.

src/popupwin.c

@@ -3855,6 +3855,11 @@ update_popups(void (*win_update)(win_T *wp))
 	// Back to the normal zindex.
 	screen_zindex = 0;
     }
+
+#if defined(FEAT_SEARCH_EXTRA)
+    // In case win_update() called start_search_hl().
+    end_search_hl();
+#endif
 }
 
 /*

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1221,
 /**/
     1220,
 /**/