Fix NRIC bug

[Cedo8]

Update Add, Delete and Edit functionality
Update test cases relating to NRIC

[codecov-io]

Codecov Report

Merging #144 into master will increase coverage by 0.31%.
The diff coverage is 90.00%.

@@             Coverage Diff              @@
##             master     #144      +/-   ##
============================================
+ Coverage     57.23%   57.54%   +0.31%     
- Complexity      448      456       +8     
============================================
  Files            91       91              
  Lines          1763     1776      +13     
  Branches        197      201       +4     
============================================
+ Hits           1009     1022      +13     
  Misses          700      700              
  Partials         54       54              

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/seedu/address/model/Model.java	100.00% <ø> (ø)	1.00 <0.00> (ø)
...java/seedu/address/logic/commands/EditCommand.java	95.29% <60.00%> (-2.30%)	13.00 <0.00> (+1.00)	⬇️
.../java/seedu/address/logic/commands/AddCommand.java	100.00% <100.00%> (ø)	9.00 <0.00> (+1.00)
...va/seedu/address/logic/commands/DeleteCommand.java	93.75% <100.00%> (+0.20%)	15.00 <1.00> (ø)
...a/seedu/address/logic/parser/AddCommandParser.java	100.00% <100.00%> (ø)	5.00 <0.00> (ø)
.../seedu/address/logic/parser/EditCommandParser.java	93.75% <100.00%> (ø)	13.00 <0.00> (ø)
src/main/java/seedu/address/model/HospifyBook.java	87.87% <100.00%> (+2.69%)	16.00 <3.00> (+3.00)
...rc/main/java/seedu/address/model/ModelManager.java	96.15% <100.00%> (+0.15%)	25.00 <1.00> (+1.00)
...main/java/seedu/address/model/patient/Patient.java	83.07% <0.00%> (+1.53%)	26.00% <0.00%> (+1.00%)
...seedu/address/model/patient/UniquePatientList.java	79.31% <0.00%> (+1.72%)	28.00% <0.00%> (+1.00%)

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