fix(tabs): Correct mdc-tab-bar-scroller class binding

[trimox]

Reported in issue #281

[codecov]

Codecov Report

Merging #283 into master will increase coverage by 0.11%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #283      +/-   ##
=========================================
+ Coverage   91.39%   91.5%   +0.11%     
=========================================
  Files          89      89              
  Lines        4345    4345              
  Branches      870     870              
=========================================
+ Hits         3971    3976       +5     
+ Misses        374     369       -5

Impacted Files	Coverage Δ
...abs/tab-bar-scroller/tab-bar-scroller.component.ts	87.5% <100%> (ø)	⬆️
src/lib/snackbar/snackbar.component.ts	82.97% <0%> (+3.54%)	⬆️

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