Fix outring tone not being silent at the end

[PvPDM]

First time contributor checklist

• I have read how to contribute to this project
• I have signed the Contributor License Agreement

Contributor checklist

• I am following the Code Style Guidelines (N/A in this case as it's just an audio file)
• I have tested my contribution on these devices:

• Device A, Android X.Y.Z
• Device B, Android Z.Y
• Virtual device W, Android Y.Y.Z

• My contribution is fully baked and ready to be merged as is
• I ensure that all the open issues my contribution fixes are mentioned in the commit message of my first commit using the Fixes #1234 syntax (There is no open issue about this problem that I could easily find)

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Description

The original outring audio is supposed to be silent at the end, but had some noise. I took the file into Audacity and replaced that nose with silence. The resulting file is ~17 KB larger and lacks some of the metadata of the original (artist and encoder field as reported by ffmpeg).

I have not tested this as setting up Android Studio is a large inconvenience at this time.