patch 8.0.1025: stray copy command in test

Problem:    Stray copy command in test.
Solution:   Remove the copy command.

Author: brammool

src/testdir/test_mksession.vim

@@ -147,7 +147,6 @@ func Test_mksession_one_buffer_two_windows()
 
   close
   bwipe!
-  !cp Xtest_mks.out /tmp
   call delete('Xtest_mks.out')
 endfunc
 

src/version.c

@@ -769,6 +769,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1025,
 /**/
     1024,
 /**/