patch 8.0.0919: cursor color isn't set on startup

Problem:    Cursor color isn't set on startup.
Solution:   Initialize showing_mode to invalid value.

src/term.c

@@ -3670,7 +3670,7 @@ cursor_off(void)
     void
 term_cursor_mode(int forced)
 {
-    static int showing_mode = NORMAL;
+    static int showing_mode = -1;
     char_u *p;
 
     /* Only do something when redrawing the screen and we can restore the

src/version.c

@@ -769,6 +769,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    919,
 /**/
     918,
 /**/