Fix the expanded layout of the branches panel (half and full screen modes)

[stefanhaller]

If the showDivergenceFromBaseBranch config is not none, the expanded branches panel would no longer show the remote branch and subject; the reason was that we padded the name all the way to the right edge of the view so that the divergence information is right-aligned.

To fix this, we simply don't right-align the divergence in half or full screen mode. This is a bit unfortunate, but it's hard to do any better, because we don't know the width of our column in advance. One thing I tried is to make the divergence a separate column in that case (with an explicit right-alignment set on it via getColumnAlignments; however, this makes it harder to properly truncate the name when the window is too narrow.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
Report missing for 24158aa1	✅ 57.14%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (24158aa)	Report Missing	Report Missing	Report Missing
Head commit (d9487bf)	60535	53008	87.57%

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#5413)	7	4	57.14%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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