patch 8.1.0446: options test fails in the GUI

Problem:    Options test fails in the GUI.
Solution:   Don't try changing 'term' in the GUI.
diff --git a/src/testdir/test_options.vim b/src/testdir/test_options.vim
index 851da1e..d3ac21c 100644
--- a/src/testdir/test_options.vim
+++ b/src/testdir/test_options.vim
@@ -272,6 +272,9 @@
 
 " Must be executed before other tests that set 'term'.
 func Test_000_term_option_verbose()
+  if has('gui_running')
+    return
+  endif
   let verb_cm = execute('verbose set t_cm')
   call assert_notmatch('Last set from', verb_cm)