patch 8.2.0309: window-local values have confusing name

Problem:    Window-local values have confusing name.
Solution:   Rename w_p_bri* to w_briopt_*.
diff --git a/src/version.c b/src/version.c
index db00344..b8e47fc 100644
--- a/src/version.c
+++ b/src/version.c
@@ -739,6 +739,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    309,
+/**/
     308,
 /**/
     307,