patch 8.2.0191: cannot put a terminal in a popup window

Problem:    Cannot put a terminal in a popup window.
Solution:   Allow opening a terminal in a popup window.  It will always have
            keyboard focus until closed.
diff --git a/src/optionstr.c b/src/optionstr.c
index 98e90a4..af4b749 100644
--- a/src/optionstr.c
+++ b/src/optionstr.c
@@ -2128,6 +2128,12 @@
 		errmsg = e_invarg;
 	}
     }
+    // 'wincolor'
+    else if (varp == &curwin->w_p_wcr)
+    {
+	if (curwin->w_buffer->b_term != NULL)
+	    term_update_colors();
+    }
 # if defined(MSWIN)
     // 'termwintype'
     else if (varp == &p_twt)