patch 8.2.3790: test for term_gettitle() fails in some environments

Problem:    Test for term_gettitle() fails in some environments.
Solution:   Make the digits after "VIM" optional. (Kenta Sato, closes #9334)

src/testdir/test_terminal2.vim

@@ -521,15 +521,11 @@ func Test_term_gettitle()
   endif
 
   let term = term_start([GetVimProg(), '--clean', '-c', 'set noswapfile', '-c', 'set title'])
-  if has('autoservername')
+  " When Vim is running as a server then the title ends in VIM{number}, thus
-    call WaitForAssert({-> assert_match('^\[No Name\] - VIM\d\+$', term_gettitle(term)) })
+  " optionally match a number after "VIM".
-    call term_sendkeys(term, ":e Xfoo\r")
+  call WaitForAssert({-> assert_match('^\[No Name\] - VIM\d*$', term_gettitle(term)) })
-    call WaitForAssert({-> assert_match('^Xfoo (.*[/\\]testdir) - VIM\d\+$', term_gettitle(term)) })
+  call term_sendkeys(term, ":e Xfoo\r")
-  else
+  call WaitForAssert({-> assert_match('^Xfoo (.*[/\\]testdir) - VIM\d*$', term_gettitle(term)) })
-    call WaitForAssert({-> assert_equal('[No Name] - VIM', term_gettitle(term)) })
-    call term_sendkeys(term, ":e Xfoo\r")
-    call WaitForAssert({-> assert_match('^Xfoo (.*[/\\]testdir) - VIM$', term_gettitle(term)) })
-  endif
 
   call term_sendkeys(term, ":set titlestring=foo\r")
   call WaitForAssert({-> assert_equal('foo', term_gettitle(term)) })

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3790,
 /**/
     3789,
 /**/