moved the theme changer slightly down

[anuragrao04]

Fixes #244

Changes made in this PR - The theme changer button has been moved slightly down inorder to avoid hitting the dynamic island on newer iPhone models

Screenshots of the changes - Refer the original issue for the before picture. After picture:

[anuragrao04]

The changes are really small but this is my first PR to this repo and flutter in general!

[manjotsidhu]

@anuragrao04 Thanks for contributing, can you send a preview on Android with the above change ?

[aman-singh7]

Hey @anuragrao04, Instead of hardcoding, could you implement it with SafeArea. Wrap the Drawer child with SaferArea and test it on the devices.

[anuragrao04]

sure! I'll get it done as soon as possible