Changed webview to Custom Tabs in Settings Page

[ujjwalagrawal17]

Description

Fixes #1143

1. Changed webview to Custom Tabs in "become beta tester" preference.

Tests performed

Manually Tested on MotoG5S+ {Android 7.1.1}, with {build variant-Debug}.

[codecov-io]

Codecov Report

Merging #1328 into master will decrease coverage by 0.6%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           master   #1328      +/-   ##
=========================================
- Coverage    3.81%   3.21%   -0.61%     
=========================================
  Files         126     132       +6     
  Lines        5919    7090    +1171     
  Branches      583     682      +99     
=========================================
+ Hits          226     228       +2     
- Misses       5678    6847    +1169     
  Partials       15      15

Impacted Files	Coverage Δ
...fr/free/nrw/commons/settings/SettingsFragment.java	29.62% <0%> (+1.05%)	⬆️
.../free/nrw/commons/di/CommonsApplicationModule.java	50% <0%> (-2.64%)	⬇️
...main/java/fr/free/nrw/commons/location/LatLng.java	52.77% <0%> (-1.51%)	⬇️
...free/nrw/commons/theme/NavigationBaseActivity.java	22.82% <0%> (-0.77%)	⬇️
.../java/fr/free/nrw/commons/auth/SessionManager.java	16.66% <0%> (-0.48%)	⬇️
...rw/commons/mwapi/ApacheHttpClientMediaWikiApi.java	5.49% <0%> (-0.32%)	⬇️
...fr/free/nrw/commons/media/MediaDetailFragment.java	0% <0%> (ø)	⬆️
...java/fr/free/nrw/commons/category/CategoryDao.java	0% <0%> (ø)	⬆️
...java/fr/free/nrw/commons/upload/ShareActivity.java	0% <0%> (ø)	⬆️
... and 37 more

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[ujjwalagrawal17]

@neslihanturan Can you review this PR.

[neslihanturan]

It crashes on API level 19:

java.lang.NoSuchMethodError: fr.free.nrw.commons.settings.SettingsFragment.getContext
                                                                               at fr.free.nrw.commons.settings.SettingsFragment.lambda$onCreate$4$SettingsFragment(SettingsFragment.java:107)

Since getcontext call requires API level 23, our min is 15

[tanvidadu]

changing getcontext() to getActivity() would work !

[neslihanturan]

Thanks @ujjwalagrawal17 !