fix: Set colour scheme for SwipeRefreshLayout in Speakers Call fragment

[ShridharGoel]

Fixes #1460

Checklist:

• I have checked for PMD and check-style issues
• I have read the Contribution & Best practices Guide and my PR follows them.
• My branch is up-to-date with the Upstream development branch.

Changes:

Colour scheme has been set for SwipeRefreshLayout in Speakers Call fragment. Now, the refresh icon would have the same colour as in the other fragments.

[codecov]

Codecov Report

Merging #1461 into development will decrease coverage by <.01%.
The diff coverage is 0%.

@@                Coverage Diff                @@
##             development    #1461      +/-   ##
=================================================
- Coverage          24.25%   24.25%   -0.01%     
  Complexity           757      757              
=================================================
  Files                237      237              
  Lines               8737     8738       +1     
  Branches             356      356              
=================================================
  Hits                2119     2119              
- Misses              6534     6535       +1     
  Partials              84       84

Impacted Files	Coverage Δ	Complexity Δ
...core/speakerscall/detail/SpeakersCallFragment.java	0% <0%> (ø)	0 <0> (ø)	⬇️

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[GOVINDDIXIT]

Mergeable is failing as PR title contain "wip"