patch 8.0.0233: paste test fails in the GUI

Problem:    The paste test fails if the GUI is being used.
Solution:   Skip the test in the GUI.
diff --git a/src/testdir/test_paste.vim b/src/testdir/test_paste.vim
index ffd2dfa..dfe6bdc 100644
--- a/src/testdir/test_paste.vim
+++ b/src/testdir/test_paste.vim
@@ -1,6 +1,9 @@
 " Tests for bracketed paste.
 
-" Bracketed paste only works with "xterm".
+" Bracketed paste only works with "xterm".  Not in GUI.
+if has('gui_running')
+  finish
+endif
 set term=xterm
 
 func Test_paste_normal_mode()