patch 8.0.0871: status line for a terminal window always has "[+]".

Problem:    The status line for a terminal window always has "[+]".
Solution:   Do make the status line include "[+]" for a terminal window.
diff --git a/src/version.c b/src/version.c
index 195be51..758ea20 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    871,
+/**/
     870,
 /**/
     869,