GPII-3851: Updated highContrast solution to use our custom themes

[javihernandez]

See https://issues.gpii.net/browse/GPII-3851

Works well with javihernandez/gpii-wix-installer@8e05df7

[gpii-bot]

CI job passed: https://ci.gpii.net/job/universal-tests/1702/

[amb26]

@javihernandez considers we might skip this one -

[13:00] <jhernandez> this was yet another "fallback" thing to "ensure" that the right high contrast theme was applied
[13:01] <jhernandez> before finding the real solution for one of the problems we had with high contrast on 1809
[13:02] <jhernandez> that is, getting the localised highcontrast theme name
[13:02] <jhernandez> when I say 1809 I mean Windows 1809 (not a JIRA or the like)
[13:03] <Bosmon> jhernandez - right
[13:04] <Bosmon> But this pull just looks like it normalises the names of some desktop themes.... I'm a bit puzzled though
[13:04] <Bosmon> Are we just storing "our own" themes in the same directory along with the builtin ones?
[13:04] <jhernandez> yes
[13:04] <Bosmon> So "hc1" is a builtin scheme?
[13:05] <jhernandez> but as stegru indicated, our themes are "uglier" than the ones from MS
[13:05] <jhernandez> yes
[13:07] <jhernandez> that's why in one hand, I thought it was a good idea to use our own custom themes - in the other hand, wasn't sure it was such good idea, why shipping our custom themes if they're supposed to be there?
[13:08] <jhernandez> don't have a strong opinion, so will be happy with either decision we take

[javihernandez]

@stegru, what are your thoughts on this?