patch 8.1.2088: renamed libvterm mouse.c file not in distributed file list

Problem:    Renamed libvterm mouse.c file not in distributed file list.
Solution:   Rename the file in the file list.
diff --git a/src/version.c b/src/version.c
index 0776a8a..35253eb 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2088,
+/**/
     2087,
 /**/
     2086,