(#187) dashboard widget text scaling

[ryanw-mobile]

The dashboard widget has a flaw that we scaled the fontScale but did not make the density constant so that the fontScale calculation is indeed incorrect if the density is not the one we expect.

Now we also hardcode the density so that the scaling will always be correct according to the available screen width.

Also we improved the drawHalfCircleArcSegment style a bit. It looks a bit better on hi-density screens.

[codacy-production[bot]]

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Coverage variation	Diff coverage
:white_check_mark: +0.00% (target: -1.00%)	:white_check_mark: ∅

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (e83f99cdaf2a9b349080bb3076f8878e845d9487) | 1705 | 780 | 45.75% | | | Head commit (ed3f06e945fbbd8c3b8e9edfa3af8b92942c1337) | 1705 (+0) | 780 (+0) | 45.75% (**+0.00%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#197) | 0 | 0 | **∅ (not applicable)** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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