Fix appdata filename in snapcraft.yaml

Version 4.3: Fix build for Linux.

Version 4.2.4.

- Fix crash in emoji statuses clearing.

Version 4.2.3: Fixed Github CI Windows and macOS builds.

Beta version 4.2.2.

- Fix crash in spoiler revealing in media captions.
- Fix spoiler revealing in media viewer captions.
- Fix crash in folder editing on Linux.

Beta version 4.2.1: Fix build with GCC.

Version 4.2.

- A new expandable reaction menu was added in private chats and groups.
- All users get access to dozens of new reactions,
including reactions previously reserved for Premium users.
- The reactions you use most frequently
will always be displayed at the top.
- Premium users can react to messages with thousands of custom emoji
and add up to 3 reactions to each message.
- Group admins can control whether
custom reactions are allowed in their groups.
- Premium users can add an animated emoji status next to their name
to display their current activity.
- To set a status, tap your Premium badge in the main menu or Settings.
- Popular suggestions for working, sleeping,
traveling and more will be shown at the top.
- To set a status for a specific duration like 1 hour or 2 days,
right click the emoji.
- A new format was supported for username links,
in addition to "t.me/username." You can now open Telegram accounts,
groups or channels using links like "username.t.me"
or "https://username.t.me."
- Improved support for long media captions.

Beta version 4.1.2: Fix build with Xcode.

Version 4.1.1.

- Fix editing media captions with animated emoji.
- Fix viewing animated emoji sets used in a message.
- Fix premium sticker tooltip auto-show in channel comments.
- Fix main window position and size restoring after relaunch.
- Other bug fixes and minor improvements.

Version 4.1: Fix build with GCC.