[PAINTROID-809] Fix hidden help menu buttons

[Knist1704]

Navigation in help screen no longer hidden behind system nav bar or 3 button navigation
Jira Link

Refactorings and Bug Fixes

• Refactored from prebuilt widget to custom
• Navigation buttons visible

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[juliajulie95]

Spray tool test is failing, please chec why and either fix the implementation or the test + describe why if you change the test

[Knist1704]

The spray tool is spraying within double the given radius, the color check afterwards was only in 1x the radius, plus the fact that some point may lie outside the canvas. The chance for non of the sprayed pixels being inside the smaller checked circle was higher, therefore failing the testcase.