Fix status bar icon color.

[brandonpage]

By default the color of the icons in the status bar is determined by the OS based, on if the user has set it to light or dark theme. This causes a readability problem if the OS/App theme and the dynamic login color differ. For example, if the user is in light theme the OS expects a light background but we display a dark status bar to match the webview this happens:

In this PR I am using our dynamicBackgroundTheme to set the window's isAppearanceLightStatusBars, which results in the status bar always being readable:

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 56.66%. Comparing base (9fe843c) to head (c01f669).
Report is 2 commits behind head on dev.

Files with missing lines	Patch %	Lines
.../src/com/salesforce/androidsdk/ui/LoginActivity.kt	0.00%	2 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #2703      +/-   ##
============================================
- Coverage     56.67%   56.66%   -0.01%     
  Complexity     2494     2494              
============================================
  Files           210      210              
  Lines         16992    16994       +2     
  Branches       2363     2364       +1     
============================================
  Hits           9630     9630              
- Misses         6315     6316       +1     
- Partials       1047     1048       +1     

Components	Coverage Δ
Analytics	47.92% <ø> (ø)
SalesforceSDK	43.10% <0.00%> (-0.01%)	⬇️
Hybrid	58.05% <ø> (ø)
SmartStore	78.20% <ø> (ø)
MobileSync	82.02% <ø> (ø)
React	52.36% <ø> (ø)

Files with missing lines	Coverage Δ
.../src/com/salesforce/androidsdk/ui/LoginActivity.kt	14.83% <0.00%> (-0.07%)	⬇️

... and 1 file with indirect coverage changes

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