[Bug Fix] Auth screens images issues

[aliseyalvi]

What does this PR?

• Fixed image clipping issue in register screen
• Fixed image clipping issues in signin screen

Issue number

fixes #2632

Screenshots/Video

[feruzm]

@aliseyalvi also please make sure both mascots are same size/visibility wise.

[aliseyalvi]

@noumantahir @feruzm I had changed mascots dimensions to percentages and its parent container to flex so it would be least affected by device dimensions. Register screen mascot seems a bit small as compared to login screen, this is because the image by default is small and it had margins on transparent background as seen in this SS

[noumantahir]

@aliseyalvi regarding sign in mascot, cannot we reduce the percentage assigned to make the both look somewhat the same size... from UI perspective, the sign in mascot looks too big for the text content on left....

Do also share screenshots of both on different simulators like iPhone 6, nexus 5, pixel 3a as well

[aliseyalvi]

[aliseyalvi]