Lambda usage simplifications

[egsavage]

Title (required)

Fixes #1926 (partially) - Code quality changes

Description (required)

Fixes #1926 (partially) - Code quality changes

Lambda usage simplifications across the project.

Tests performed (required)

Basic compilation at this point.

[codecov-io]

Codecov Report

Merging #1928 into master will increase coverage by <.01%.
The diff coverage is 1.75%.

@@            Coverage Diff            @@
##           master   #1928      +/-   ##
=========================================
+ Coverage    3.71%   3.71%   +<.01%     
=========================================
  Files         192     192              
  Lines        9915    9896      -19     
  Branches      886     886              
=========================================
  Hits          368     368              
+ Misses       9520    9501      -19     
  Partials       27      27

Impacted Files	Coverage Δ
.../free/nrw/commons/upload/SingleUploadFragment.java	0% <0%> (ø)	⬆️
...c/main/java/fr/free/nrw/commons/AboutActivity.java	0% <0%> (ø)	⬆️
...free/nrw/commons/wikidata/WikidataEditService.java	0% <0%> (ø)	⬆️
...explore/recentsearches/RecentSearchesFragment.java	0% <0%> (ø)	⬆️
...fr/free/nrw/commons/media/MediaDetailFragment.java	0% <0%> (ø)	⬆️
.../fr/free/nrw/commons/widget/PicOfDayAppWidget.java	0% <0%> (ø)	⬆️
...r/free/nrw/commons/auth/AuthenticatedActivity.java	0% <0%> (ø)	⬆️
...nrw/commons/notification/NotificationActivity.java	0% <0%> (ø)	⬆️
...in/java/fr/free/nrw/commons/quiz/QuizActivity.java	0% <0%> (ø)	⬆️
...a/fr/free/nrw/commons/quiz/QuizResultActivity.java	0% <0%> (ø)	⬆️
... and 2 more

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[domdomegg]

Tested tutorial, login, home, about (inc. tranlate wiki link), explore (inc. searching and checking recent searches) and viewing media.

2.8.3-debug-pr-1928~ef2e6ea6 on Samsung Galaxy S6 with API level 25.
2.8.3-debug-pr-1928~ef2e6ea6 on Galaxy Nexus (simulated) with API level 28.

Results:

• All working perfectly