Make full-screen mode actually full-screen

[chrisgarrity]

From @tmickel on November 18, 2015 19:21

Right now the project is framed in a black area. Paula did a UI test with another app where the green flag/exit buttons were just over the project, and thinks having it actually full-screen would be a great improvement

Copied from original issue: LLK/scratchjr-private#388

[chrisgarrity]

From @tmickel on December 30, 2015 19:53

UI.js:846

Remove - (136 * scaleMultiplier)

If we actually want to implement this, we probably need to figure out a better icon for "return to project"

[deepankarmalhan]

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