patch 8.0.0798: no highlighting in a terminal window with a finished job

Problem:    No highlighting in a terminal window with a finished job.
Solution:   Highlight the text.
diff --git a/src/undo.c b/src/undo.c
index aeca25f..6ab8572 100644
--- a/src/undo.c
+++ b/src/undo.c
@@ -419,6 +419,10 @@
 	    }
 	}
 #endif
+#ifdef FEAT_TERMINAL
+	/* A change in a terminal buffer removes the highlighting. */
+	term_change_in_curbuf();
+#endif
 
 #ifdef FEAT_AUTOCMD
 	/*