Remove reapply from Android Widget.__init__

[HalfWhitt]

The comment about Android needing to reapply styles after a widget's constructed piqued my curiosity... Does it?

I'm pretty sure this is just a holdover from before #2942, when all backends had to do this.

PR Checklist:

• All new features have been tested
• All new features have been documented
• I have read the CONTRIBUTING.md file
• I will abide by the code of conduct

[HalfWhitt]

With this removed, the only thing that calls reapply() — except for Pack's own reapply(), which gets around issues with deprecated aliases — is the _applicator setter in BaseStyle. Though that could potentially change, to rework around #3161.

[mhsmith]

I'm pretty sure this is just a holdover from before #2942, when all backends had to do this.

I think you're probably right, and this PR doesn't break anything as far as I can tell. But I'll let @freakboy3742 check it before merging, because he's more familiar with the details of #2942.

[freakboy3742]

Agreed this should be redundant because of the changes in #2942; so it looks like it works in theory and practice! :-)