Githawk: Small tweak on tab bar icons

[zhubofei]

[zhubofei]

Remove sharp edges and give them the same stroke-thickness. Bring tab bar icons closer to the Outlook style in #1271

[Huddie]

Just keep bookmark consistency (issue #1950)

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[rnystrom]

Is the font heavier too?

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[zhubofei]

@rnystrom The font is the same. iPhone8 simulator might be the reason why it looks heavier.

[Huddie]

@zhubofei @rnystrom If you look at Outlook or Twitter they remove the text from the Tabbar. I think this could allow for a cleaner look in GitHawk as well. (#1956)

[rnystrom]

I'm gonna make a call to leave them as is. Don't feel persuaded that this is the right change.

[zhubofei]

@rnystrom I agree! Icons are also of lower priority compare to feed layouts. These tweaks can wait until the layouts are stable 👍