Fixes #1406 - Error messages in LoginActivity disappear after orientation change.

[knight-shade]

Description

Fixes #1406

Now the error messages in LoginActivity persist after orientation change.

Tests performed

Tested on API level 19 & 24 & on MIUI Note 4 , with build variant BetaDebug.

Screenshots showing what changed

Before

After

[codecov-io]

Codecov Report

Merging #1407 into master will decrease coverage by <.01%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           master   #1407      +/-   ##
=========================================
- Coverage     3.3%    3.3%   -0.01%     
=========================================
  Files         128     128              
  Lines        6837    6847      +10     
  Branches      669     671       +2     
=========================================
  Hits          226     226              
- Misses       6596    6606      +10     
  Partials       15      15

Impacted Files	Coverage Δ
...n/java/fr/free/nrw/commons/auth/LoginActivity.java	0% <0%> (ø)	⬆️

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[neslihanturan]

Thanks @knight-shade this works