fix: resolve issue where 'Join' button was hidden

[kazutoiris]

Resolve issue where 'Join' button was hidden when DisableChannelMuteButton is enabled

Description

In the Nnngram client, when the DisableChannelMuteButton setting was enabled, the 'Join' button was also hidden along with the 'Mute/Unmute' button.

Issues Fixed or Closed by This PR

Same as PreviousAlone/Nnngram:#85.

Check List

• I have tested the changes and verified that they work and don't break anything(as well as I can manage) or drop the support for previous versions.
• My code follows the code style of this project
• I have merged commits that are meaningless for follow-up work and confirmed that they will not cause damage to follow-up maintenance

Summary by Sourcery

Bug Fixes:

• Ensure the DisableChannelMuteButton setting only hides the mute/unmute control and does not hide the Join button for broadcast channels.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adjusts the logic that hides the bottom overlay when DisableChannelMuteButton is enabled so that it only hides controls for channels the user is already a member of, ensuring the 'Join' button remains visible for channels the user has not joined yet.

File-Level Changes

Change	Details	Files
Tightened the condition for hiding the bottom overlay when the DisableChannelMuteButton setting is active so it applies only if the user is already in the channel.	Added a requirement that the current chat must be a channel the user is currently in before hiding the bottom overlay. Preserved existing constraints: default chat mode, not a report chat, non-null chat, channel type, broadcast channel, and read-only (cannot write) state.	TMessagesProj/src/main/java/org/telegram/ui/ChatActivity.java

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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