Update ohmyzsh.json

Add support for .zshrc.pre-oh-my-zsh

programs/ohmyzsh.json

@@ -4,6 +4,11 @@
             "path": "$HOME/.oh-my-zsh",
             "movable": true,
             "help": "See the relevant [issue](https://github.com/ohmyzsh/ohmyzsh/issues/9543).\n\nExport the following environment variables:\n\n```bash\nexport ZSH=\"$XDG_DATA_HOME\"/oh-my-zsh \n```\n"
+        },
+        {
+            "path": "$HOME/.zshrc.pre-oh-my-zsh",
+            "movable": true,
+            "help": "If it exists, it is used when switching back to the default shell you had before installing Oh My Zsh. See the [FAQ](https://github.com/ohmyzsh/ohmyzsh/wiki/FAQ#how-do-i-uninstall-oh-my-zsh) for more information.\n\nYou can either back it up elsewhere or delete it.\n"
         }
     ],
     "name": "ohmyzsh"