Fix sort view bug

[papataco14]

Summary

• Fixes the UI bug where sorting after find or filter shows the full company list instead of the current showed company list
• Modify test cases
• Add logging
• Improve code quality

[codecov[bot]]

Codecov Report

Merging #267 (21d55bf) into master (576cde5) will decrease coverage by 0.02%. The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #267      +/-   ##
============================================
- Coverage     74.14%   74.12%   -0.02%     
+ Complexity      579      578       -1     
============================================
  Files            88       88              
  Lines          1895     1894       -1     
  Branches        220      220              
============================================
- Hits           1405     1404       -1     
  Misses          409      409              
  Partials         81       81              

Files	Coverage Δ
...java/seedu/address/logic/commands/SortCommand.java	100.00% <100.00%> (ø)
src/main/java/seedu/address/model/AddressBook.java	87.50% <ø> (-0.60%)	:arrow_down:
src/main/java/seedu/address/model/Model.java	100.00% <ø> (ø)
...rc/main/java/seedu/address/model/ModelManager.java	95.83% <100.00%> (-0.06%)	:arrow_down:
...seedu/address/model/company/UniqueCompanyList.java	83.33% <ø> (-1.42%)	:arrow_down: