legacy tests: migrate test_qf_title

src/nvim/testdir/test_qf_title.in

@@ -1,18 +0,0 @@
-Tests for quickfix window's title     vim: set ft=vim :
-
-STARTTEST
-:so small.vim
-:if !has('quickfix') | e! test.ok | wq! test.out | endif
-:set efm=%E%f:%l:%c:%m
-:cgetexpr ['file:1:1:message']
-:let qflist=getqflist()
-:call setqflist(qflist, 'r')
-:copen
-:let g:quickfix_title=w:quickfix_title
-:wincmd p
-:$put =g:quickfix_title
-:/^Results/,$w test.out
-:qa!
-ENDTEST
-
-Results of test_qf_title:

src/nvim/testdir/test_qf_title.ok

@@ -1,2 +0,0 @@
-Results of test_qf_title:
-:setqflist()