patch 9.1.0663: tests: zip test still resets 'shellslash' option

Problem:  tests: zip test still resets 'shellslash' option
Solution: Remove resetting the 'shellslash' option, the zip
          plugin should now be able to handle this options

closes: #15434

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index 3a6faeb..c4ade6f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    663,
+/**/
     662,
 /**/
     661,