test: fix flaky box/access_sysview.test.lua

Some guest user privileges were not revoked in the
end.

(cherry picked from commit 44d4555b)

test/box/access_sysview.result

@@ -689,7 +689,7 @@ box.session.su('admin')
 ---
 ...
 -- _vcollation is readable anyway.
-box.schema.user.revoke("guest", "read", "space", "_collation")
+box.schema.user.revoke("guest", "read, write, alter, execute", "space", "_collation")
 ---
 ...
 box.session.su("guest")

test/box/access_sysview.test.lua

@@ -287,7 +287,7 @@ box.space._vcollation:select{0}
 box.session.su('admin')
 
 -- _vcollation is readable anyway.
-box.schema.user.revoke("guest", "read", "space", "_collation")
+box.schema.user.revoke("guest", "read, write, alter, execute", "space", "_collation")
 box.session.su("guest")
 #box.space._vcollation:select{}
 session.su('admin')