Fix issue 143 and 144

[CJ-Lee01]

#143 : Edits to company names are not reflected in list of applications.
#144 : Editing application names to same name is allowed.

[codecov]

Codecov Report

Merging #148 (386703c) into master (579f6d0) will decrease coverage by 0.29%.
The diff coverage is 57.14%.

@@             Coverage Diff              @@
##             master     #148      +/-   ##
============================================
- Coverage     77.45%   77.16%   -0.29%     
- Complexity      916      929      +13     
============================================
  Files            98       98              
  Lines          2896     2943      +47     
  Branches        406      418      +12     
============================================
+ Hits           2243     2271      +28     
- Misses          506      519      +13     
- Partials        147      153       +6     

Files	Coverage Δ
...java/seedu/address/logic/commands/EditCommand.java	89.47% <100.00%> (+0.12%)	⬆️
...dress/model/jobapplication/JobApplicationList.java	85.71% <100.00%> (+22.07%)	⬆️
...u/address/model/jobapplication/JobApplication.java	86.84% <20.00%> (-4.71%)	⬇️
...rc/main/java/seedu/address/model/ModelManager.java	78.51% <70.00%> (-1.29%)	⬇️
...java/seedu/address/model/contact/Organization.java	56.86% <31.25%> (-12.59%)	⬇️

[McNaBry]

Fixes to the issues work on my end. Overall, looks good to me.