PAINTROID-672: Refactor MediaGalleryWebViewClient to kotlin

[theMr17]

Jira Ticket: PAINTROID-672
Description: Refactored MediaGalleryWebViewClient from Java to Kotlin

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[janvitekwani]

i would like to work on this , i just a beginner i really want to try can u please assign this issue to me

[aman021202]

can i work on this issue.