fix: MultiSelect close on click when opened

[Kartik18g]

• I have read the Contributing Guide
• I have signed the CLA
• Lint and unit tests pass locally with my changes
• I have labeled the PR correctly with the related package
• I have run Loki's visual regression tests (if applicable)
• I have added tests that prove my fix is effective or that my feature works (if applicable)
• I have added necessary documentation (if applicable)
• Any dependent changes have been merged and published in downstream modules

Proposed changes (including videos or screenshots)

#417 by PriyaBihani resolves #412, this PR extends it to multi-select as well.
Previously
https://user-images.githubusercontent.com/70897225/112707552-49f4fa00-8ed2-11eb-8760-6ffa6ab790d7.mov
Now
https://user-images.githubusercontent.com/70897225/112707563-5b3e0680-8ed2-11eb-9f2d-92e5235b239b.mov

Issue(s)

Further comments

[lgtm-com]

This pull request introduces 1 alert and fixes 2 when merging f5b51ae into ba0eb1c - view on LGTM.com

new alerts:

• 1 for Syntax error

fixed alerts:

• 1 for Implicit operand conversion
• 1 for Use of returnless function