For #5972 - Fixes bugs when launching in private mode on Android 5

[boek]

There are some issues on Android 5 using activity-aliases so we took that out. In the process of testing opening new links in private mode we noticed the HomeFragment wasn't getting an onResume call when navigating from the browserFragment back to the homeFragment after opening an intent link. Moving that logic to onStart/onStop fixed it.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@db02fc6). Click here to learn what that means.
The diff coverage is 20%.

@@            Coverage Diff            @@
##             master    #6702   +/-   ##
=========================================
  Coverage          ?   17.19%           
  Complexity        ?      365           
=========================================
  Files             ?      272           
  Lines             ?    10769           
  Branches          ?     1513           
=========================================
  Hits              ?     1852           
  Misses            ?     8765           
  Partials          ?      152

Impacted Files	Coverage Δ	Complexity Δ
...c/main/java/org/mozilla/fenix/home/HomeFragment.kt	0% <0%> (ø)	0 <0> (?)
...n/java/org/mozilla/fenix/IntentReceiverActivity.kt	50% <50%> (ø)	4 <0> (?)

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[ekager]

Can you clean up ktlint pls :)