Change order of keymap entries so cmd-enter is last and gets displayed

Previously `ctrl-enter` (which maps to the same command) was displayed and this is masked by another commonly used package called `intentions` (dependency for `linter-ui-default`)

Author: kuychaco

keymaps/git.cson

@@ -76,6 +76,8 @@
 '.platform-darwin .github-FilePatchView atom-text-editor:not([mini])':
   'cmd-/': 'github:toggle-patch-selection-mode'
   'cmd-backspace': 'github:discard-selected-lines'
+  'ctrl-backspace': 'github:discard-selected-lines'
+  'ctrl-enter': 'core:confirm'
   'cmd-enter': 'core:confirm'
   'cmd-right': 'github:surface'
   'cmd-o': 'github:jump-to-file'