fix: add spacing to searchbar and simplify render conditions [FC-0062]

[rpenido]

Description

This PR adds padding between the search bar and the library list.

Also, the render method was refactored to be a bit simpler.

Before

After

Additional Information

• Part of:
  • Add library content to a course #1337 (comment)

Testing instructions

• Open http://apps.local.edly.io:2001/course-authoring/component-picker
• Check the spacing between the search bar and the library list

---

Private ref: FAL-3931

[openedx-webhooks]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.27%. Comparing base (949e4ac) to head (68c8fce).
Report is 6 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1461   +/-   ##
=======================================
  Coverage   93.27%   93.27%           
=======================================
  Files        1052     1052           
  Lines       20462    20460    -2     
  Branches     4298     4382   +84     
=======================================
- Hits        19086    19085    -1     
+ Misses       1316     1312    -4     
- Partials       60       63    +3     

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[navinkarkera]

@rpenido Looks good to me. 👍