Add realm icon to AccountItems in organisation switcher, Fixes: #392

[vaibhavs2]

Fixes: #392

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The third image above, I created that mannualy to show some realm icons together :)

If some wonder why I made icon container round look at the image below(not looking good), sometime we can get round icon sometime square shaped, so its better to have round container, we can adjust square shaped Icons in round container.

[chrisbobbe]

If some wonder why I made icon container round look at the image below(not looking good), sometime we can get round icon sometime square shaped, so its better to have round container, we can adjust square shaped Icons in round container.

I disagree; I think we'd be better off using the image with no shape change, or at most make it a square with (slightly) rounded corners. I think the basic reason is that some realm logos weren't built to look best as a circle (especially not one with this choice of radius relative to the image's dimensions), and we shouldn't assume they were. See #205 and #3398 where we settled on rounded-corner squares for avatar images for that reason. 🙂

[vaibhavs2]

Made corner slightly rounded :)

again above list mannualy created

[vaibhavs2]

@chrisbobbe thanks for review, now its ready for another review :)