misc/py-oterm: Fix a runtime error

• Due to an incompatibility with the recent version of textproc/py-textual, oterm crashes when there are saved chats, with the following error

│ /usr/local/lib/python3.11/site-packages/textual/widget.py:984 in mount │
│ │
│ 981 │ │ if self._closing or self._pruning: ╭──────────── locals ────────────╮ │
│ 982 │ │ │ return AwaitMount(self, []) │ after = None │ │
│ 983 │ │ if not self.is_attached: │ before = None │ │
│ ❱ 984 │ │ │ raise MountError(f"Can't mount widget(s) before {self!r} is mounted") │ self = TabPane(id='chat-1') │ │
│ 985 │ │ # Check for duplicate IDs in the incoming widgets │ widgets = (ChatContainer(),) │ │
│ 986 │ │ ids_to_mount = [ ╰────────────────────────────────╯ │
│ 987 │ │ │ widget_id for widget in widgets if (widget_id := widget.id) is not None │
╰─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
MountError: Can't mount widget(s) before TabPane(id='chat-1') is mounted

So add the patch patch-oterm_app_oterm.py, that is a simple workaround
waiting for an official solution by upstream.

• Bump PORTREVISION