Updates browser tab title setting method

[lenzpaul]

Refactoring with the primary goal of improving the code coverage metric. Previously the code coverage was 96.57% and now it is 97.1%. This change does not introduce new functionality nor change the existing behavior.

The changes are as follows:

• Removed kIsWeb condition for calling the logic to set the title of the tab.
• Introduced a new function setTabTitle. On web it calls on dart:html to set the title of the browser tab. On mobile, it is a no-op.

These changes allow the coverage tool to reach the code that sets the title of the tab on web.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (4a675d2) 96.56% compared to head (a827d12) 97.11%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #657      +/-   ##
==========================================
+ Coverage   96.56%   97.11%   +0.55%     
==========================================
  Files          13       14       +1     
  Lines         903      902       -1     
==========================================
+ Hits          872      876       +4     
+ Misses         31       26       -5     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[slovnicki]

Thanks @lenzpaul! 💙