patch 8.1.0690: setline() and setbufline() do not clear text properties

Problem:    setline() and setbufline() do not clear text properties.
Solution:   Clear text properties when setting the text.
diff --git a/src/version.c b/src/version.c
index 4b7c9ae..8e14a2e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -800,6 +800,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    690,
+/**/
     689,
 /**/
     688,