Update ScreenSaver to 1.1.1

[xfangfang]

Update ScreenSaver to 1.1.1

1. Fix the crashing in the latest SteamClient
2. Add support for MPV

How to test

1. open Chrome / VLC / MPV
2. Play a video
3. Check that the screen won’t go to sleep while video is playing

Task Checklist

Developer

• I am the original author or an authorized maintainer of this plugin.
• I have abided by the licenses of the libraries I am utilizing, including attaching license notices where appropriate.

Plugin

• I have verified that my plugin works properly on the Stable and Beta update channels of SteamOS.
• I have verified my plugin is unique or provides more/alternative functionality to a plugin already on the store.

Backend

• No: I am using a custom backend other than Python.
• No: I am using a tool or software from a 3rd party FOSS project that does not have it's dependencies statically linked.
• No: I am using a custom binary that has all of its dependencies statically linked.

Community

• I have tested and left feedback on two other pull requests for new or updating plugins.
• I have commented links to my testing report in this PR.

#861 (comment)
#860 (comment)

Testing

• Tested by a third party on SteamOS Stable or Beta update channel.

[EMERALD0874]

@xfangfang You are attempting to build two plugins. Please rebase from main so only your plugin is built.

[EMERALD0874]

LGTM for testing store