test/old: skip Test_addr_all() for now

It needs patch v8.1.0341 to pass.
Patch v8.1.0341 fails Test_nocatch_wipe_all_buffers().

src/nvim/testdir/test_usercommands.vim

@@ -342,6 +342,7 @@ func Test_use_execute_in_completion()
 endfunc
 
 func Test_addr_all()
+  throw 'skipped: requires patch v8.1.0341 to pass'
   command! -addr=lines DoSomething let g:a1 = <line1> | let g:a2 = <line2>
   %DoSomething
   call assert_equal(1, g:a1)