vim-patch:9.1.1945: tests: Test_getbufwintabinfo() leaves swapfiles behind

Problem:  tests: Test_getbufwintabinfo() leaves swapfiles behind
Solution: Close all open buffers using %bw!

https://github.com/vim/vim/commit/397ad21268904d977ffe86db684a5d460daba8ed

Co-authored-by: Christian Brabandt <cb@256bit.org>

test/old/testdir/test_bufwintabinfo.vim

@@ -112,6 +112,7 @@ func Test_getbufwintabinfo()
   call assert_true(winlist[2].quickfix)
   call assert_false(winlist[2].loclist)
   wincmd t | only
+  %bw!
 endfunc
 
 function Test_get_wininfo_leftcol()