Update DeleteFieldCommand

[potty10]

Update delete-field to delete fields too.

[codecov]

Codecov Report

Patch coverage: 85.71% and project coverage change: +0.25 🎉

Comparison is base (b81945a) 77.77% compared to head (ad6d82b) 78.03%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #137      +/-   ##
============================================
+ Coverage     77.77%   78.03%   +0.25%     
- Complexity      579      582       +3     
============================================
  Files            79       79              
  Lines          1683     1689       +6     
  Branches        188      191       +3     
============================================
+ Hits           1309     1318       +9     
+ Misses          314      310       -4     
- Partials         60       61       +1     

Impacted Files	Coverage Δ
.../internship/logic/commands/DeleteFieldCommand.java	86.36% <ø> (ø)
...ernship/logic/parser/DeleteFieldCommandParser.java	89.74% <33.33%> (+8.66%)	⬆️
...a/seedu/internship/logic/commands/CopyCommand.java	100.00% <100.00%> (ø)
.../internship/logic/commands/DeleteIndexCommand.java	85.18% <100.00%> (ø)
...a/seedu/internship/logic/commands/FindCommand.java	100.00% <100.00%> (ø)
...edu/internship/logic/parser/CopyCommandParser.java	77.77% <100.00%> (+6.34%)	⬆️
...ernship/logic/parser/DeleteIndexCommandParser.java	81.81% <100.00%> (+4.04%)	⬆️

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[eugenetangkj]

Looks great to merge 👍