Jwen/scoreboard UI fix

[jiabaow]

fix the bug in scoreboard ui where the 1st row doesn't show up.

[kamilababayeva]

Looks good! Thanks!

Comments for next pr:
The background in the choosing genre for scoreboard differs from other activities, it is whiter.
Also, maybe we can display scoreboard from the highest score to lowest?

[jiabaow]

Looks good! Thanks!

Comments for next pr: The background in the choosing genre for scoreboard differs from other activities, it is whiter. Also, maybe we can display scoreboard from the highest score to lowest?

Thanks for the feedback, I didn't notice the color, the scoreboard sorting can be done in another PR when retrieving real data from firebase per genre, this PR is only a UI fix.

[laurislopata]

LGTM, since it's pretty small not too much to comment

[codeclimate]

Code Climate has analyzed commit 9239d66 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (80% is the threshold).

This pull request will bring the total coverage in the repository to 85.8%.

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