android: File picker shows all files instead of image gallery UI

[Vishnukumardev]

This address the issue #1490 that shows all types of files (PDFs, videos, etc.), not just images.
Discussion :
https://chat.zulip.org/#narrow/channel/48-mobile/topic/Issue.20with.20Gallery.20icon.20behavior

Vide reference given below for the fix

Issue-114.mp4

Fixes : #1490

[Asteriskkkk]

@Vishnukumardev Please go thorugh guide on submitting a PR here you can also look for other maintainers PR and commit for reference. Thanks!

[chrisbobbe]

When you tap the gallery button, the intended behavior is to show videos and images for the user to choose from. It looks like this PR would have it show only images, making it impossible for the user to upload videos this way.

[Vishnukumardev]

I agree @chrisbobbe .Also,there is an ongoing discussion to change the package that handles the media uploading due to unmaintained timeline of the current package used in the app.It is better to keep this issue put.If the package changes as it bear no value.

[Vishnukumardev]

On second thought,If memory serves me correctly.There hasn't been a dedicated ui for multiple types of file picking option.There is only a button that just loads all the files from the memory .This issue specifically intends to upload image.That is what this PR intends to do.But.if we want to add videos.That is a different scenario I guess.Glad to hear your thoughts moving forward.