Fixes #1487 Added hideKeyboard in ViewUtil

[ujjwalagrawal17]

Description

Fixes #1487

Deleted hidekeyboard method from various fragments and add a static method in ViewUtil.java for reusing the code. used staic method in various fragments, activities.

Tests performed

Manually Tested on API 25(Moto G5S+)with {debug variant}

[codecov-io]

Codecov Report

Merging #1488 into master will increase coverage by <.01%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           master   #1488      +/-   ##
=========================================
+ Coverage     3.2%   3.21%   +<.01%     
=========================================
  Files         132     132              
  Lines        7109    7090      -19     
  Branches      686     682       -4     
=========================================
  Hits          228     228              
+ Misses       6866    6847      -19     
  Partials       15      15

Impacted Files	Coverage Δ
...nrw/commons/upload/MultipleUploadListFragment.java	0% <0%> (ø)	⬆️
.../free/nrw/commons/upload/SingleUploadFragment.java	0% <0%> (ø)	⬆️
...java/fr/free/nrw/commons/upload/ShareActivity.java	0% <0%> (ø)	⬆️
.../main/java/fr/free/nrw/commons/utils/ViewUtil.java	0% <0%> (ø)	⬆️
...n/java/fr/free/nrw/commons/auth/LoginActivity.java	0% <0%> (ø)	⬆️
...e/nrw/commons/category/CategorizationFragment.java	0% <0%> (ø)	⬆️

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