Update test for LeftDrawerEventWrapper.tsx to 100% coverage

[timoph2]

Update test for LeftDrawerEventWrapper.tsx to 100% coverage.
Fixes #1033

Summary
Added tests which covers line 40, where pageContainer was not previously tested for 'expand' or 'contract' class.

Does this PR introduce a breaking change?
No

Other information
Chose to use Regex because pageContainer classes somehow had extra suffix added in like "_pageContainer_1k3kw_1" which .toHaveClass method cannot assert properly.

Have you read the contributing guide?
Yes

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (655b6b3) 92.77% compared to head (09b5363) 92.80%.
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1103      +/-   ##
===========================================
+ Coverage    92.77%   92.80%   +0.03%     
===========================================
  Files          134      134              
  Lines         3238     3238              
  Branches       904      904              
===========================================
+ Hits          3004     3005       +1     
+ Misses         225      224       -1     
  Partials         9        9              

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[beingnoble03]

LGTM. Thanks @timoph2