patch 8.2.0051: command line completion test skipped

Problem:    Command line completion test skipped. (Christian Brabandt)
Solution:   Invert condition.
diff --git a/src/testdir/test_cmdline.vim b/src/testdir/test_cmdline.vim
index 38b5826..6dc6c89 100644
--- a/src/testdir/test_cmdline.vim
+++ b/src/testdir/test_cmdline.vim
@@ -555,10 +555,9 @@
 
 func Test_cmdline_complete_bang()
   if executable('whoami')
-    return
+    call feedkeys(":!whoam\<C-A>\<C-B>\"\<CR>", 'tx')
+    call assert_match('^".*\<whoami\>', @:)
   endif
-  call feedkeys(":!whoam\<C-A>\<C-B>\"\<CR>", 'tx')
-  call assert_match('^".*\<whoami\>', @:)
 endfunc
 
 funct Test_cmdline_complete_languages()
diff --git a/src/version.c b/src/version.c
index 568c156..b8c4870 100644
--- a/src/version.c
+++ b/src/version.c
@@ -743,6 +743,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    51,
+/**/
     50,
 /**/
     49,