patch 9.1.2038: tests: test_marks.vim leaves swapfiles behind

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

closes: #19061

Signed-off-by: Christian Brabandt <cb@256bit.org>

src/testdir/test_marks.vim

@@ -254,7 +254,7 @@ func Test_marks_k_cmd()
   call setline(1, ['foo', 'bar', 'baz', 'qux'])
   1,3kr
   call assert_equal([0, 3, 1, 0], getpos("'r"))
-  close!
+  bw!
 endfunc
 
 " Test for file marks (A-Z)
@@ -307,7 +307,7 @@ func Test_getmarklist()
         \ {'mark': "'[", 'pos': [bufnr(), 2, 1, 0]},
         \ {'mark': "']", 'pos': [bufnr(), 2, v:maxcol, 0]},
         \ ], getmarklist(bufnr())[-2:])
-  close!
+  bw!
 endfunc
 
 " This was using freed memory

src/version.c

@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2038,
 /**/
     2037,
 /**/