🖍 amp-social-share: update brand colors for facebook and pinterest

[Jessman5]

No description provided.

[googlebot]

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[Jessman5]

I signed it!

[googlebot]

CLAs look good, thanks!

ℹ️ Googlers: Go here for more info.

[cathyxz]

Thanks a lot for this! I think you've branched off a broken build--sorry. Would you mind merging or rebasing latest master?

[Jessman5]

damn, sure. Thank you

[Jessman5]

@cathyxz my branch is now up to date.

[aghassemi]

Thank you!