Closes #219: Disable toolbar scroll animation

[mcomella]

Pull Request checklist

• [x] This PR includes thorough tests or an explanation of why it does not
• [x] This PR includes a CHANGELOG entry or does not need one
• [x] The UI tests are passing after this PR (./gradlew connectedAmazonWebViewDebugAndroidTest)
• [x] I have considered adding QA labels on the associated issue (not this PR; qa-ready or qa-denied)

[codecov-io]

Codecov Report

Merging #245 into master will increase coverage by 0.25%. The diff coverage is 0%.

@@             Coverage Diff              @@
##             master     #245      +/-   ##
============================================
+ Coverage     34.67%   34.92%   +0.25%     
- Complexity      370      372       +2     
============================================
  Files           123      122       -1     
  Lines          3247     3238       -9     
  Branches        507      505       -2     
============================================
+ Hits           1126     1131       +5     
+ Misses         2023     2008      -15     
- Partials         98       99       +1

Impacted Files	Coverage Δ	Complexity Δ
...main/java/org/mozilla/focus/session/SessionRepo.kt	100% <ø> (ø)	3 <0> (ø)	:arrow_down:
...org/mozilla/focus/architecture/ViewModelFactory.kt	0% <ø> (ø)	0 <0> (ø)	:arrow_down:
...pp/src/main/java/org/mozilla/focus/MainActivity.kt	0% <ø> (ø)	0 <0> (ø)	:arrow_down:
...lla/focus/toolbar/BrowserAppBarLayoutController.kt	41.66% <0%> (+41.66%)	2 <0> (+2)	:arrow_up:
...lla/focus/session/VisibilityLifeCycleCallback.java	25% <0%> (+12.5%)	3% <0%> (+2%)	:arrow_up:

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