vim-patch:9.2.0125: tests: test_textformat.vim leaves swapfiles behind

Problem:  tests: test_textformat.vim leaves swapfiles behind
Solution: Close open buffer using :bw! instead of :close!

271f4fe47b

N/A patches:
vim-patch:9.2.0122: Vim still supports compiling on NeXTSTEP
vim-patch:bab7619: runtime(doc): Update intro.txt about Neovim

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

test/old/testdir/test_textformat.vim

@@ -623,7 +623,7 @@ func Test_format_align()
     right
     setlocal norightleft
     call assert_equal("Vim", getline(1))
-    close!
+    bw!
   endif
 
   set tw&
@@ -1033,7 +1033,7 @@ func Test_mps_latin1()
   normal %
   call assert_equal(4, col('.'))
   let &encoding = save_enc
-  close!
+  bw!
 endfunc
 
 func Test_empty_matchpairs()
@@ -1173,7 +1173,7 @@ func Test_visual_gq_format()
   redraw!
   normal gq
   setl textwidth&
-  close!
+  bw!
 endfunc
 
 " Test for 'n' flag in 'formatoptions' to format numbered lists
@@ -1186,7 +1186,7 @@ func Test_fo_n()
   normal gggqG
   call assert_equal(['  1) one two', '     three', '     four', '  2) two'],
         \ getline(1, '$'))
-  close!
+  bw!
 endfunc
 
 " Test for 'formatlistpat' option
@@ -1200,7 +1200,7 @@ func Test_formatlistpat()
   normal gggqG
   call assert_equal(['  - one', '    two', '    three', '  - two'],
         \ getline(1, '$'))
-  close!
+  bw!
 endfunc
 
 " Test for the 'b' and 'v' flags in 'formatoptions'
@@ -1233,7 +1233,7 @@ func Test_fo_b()
   call feedkeys('Amore five', 'xt')
   call assert_equal(['one two three fourmore', 'five'], getline(1, '$'))
 
-  close!
+  bw!
 endfunc
 
 " Test for the '1' flag in 'formatoptions'. Don't wrap text after a one letter
@@ -1253,7 +1253,7 @@ func Test_fo_1()
   call feedkeys('A a bird', 'xt')
   call assert_equal(['one two three four', 'a bird'], getline(1, '$'))
 
-  close!
+  bw!
 endfunc
 
 " Test for 'l' flag in 'formatoptions'. When starting insert mode, if a line
@@ -1273,7 +1273,7 @@ func Test_fo_l()
   call feedkeys('A six', 'xt')
   call assert_equal(['one two three four five six'], getline(1, '$'))
 
-  close!
+  bw!
 endfunc
 
 " Test for the '2' flag in 'formatoptions'
@@ -1289,7 +1289,7 @@ func Test_fo_2()
   call assert_equal(["\tfirst line of a",
         \ "paragraph.  second line of the",
         \ "same paragraph.  third line."], getline(1, '$'))
-  close!
+  bw!
 endfunc
 
 " This was leaving the cursor after the end of a line.  Complicated way to