patch 8.2.1253: CTRL-K in Insert mode gets <CursorHold> inserted

Problem:    CTRL-K in Insert mode gets <CursorHold> inserted. (Roland
            Puntaier)
Solution:   Do not reset did_cursorhold, restore it. (closes #6447)
diff --git a/src/normal.c b/src/normal.c
index ae2c1f5..4a86e75 100644
--- a/src/normal.c
+++ b/src/normal.c
@@ -499,6 +499,7 @@
 #ifdef FEAT_EVAL
     int		set_prevcount = FALSE;
 #endif
+    int		save_did_cursorhold = did_cursorhold;
 
     CLEAR_FIELD(ca);	// also resets ca.retval
     ca.oap = oap;
@@ -1025,7 +1026,7 @@
 	out_flush();
 #endif
     if (ca.cmdchar != K_IGNORE)
-	did_cursorhold = FALSE;
+	did_cursorhold = save_did_cursorhold;
 
     State = NORMAL;