Fix findCommand context bug

[PrestonTYR]

Fix bug where findCommand does not reset the accessed patient in the model's context

[codecov-io]

Codecov Report

Merging #224 (932323c) into master (9673d10) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #224      +/-   ##
============================================
+ Coverage     65.46%   65.47%   +0.01%     
  Complexity      852      852              
============================================
  Files           120      120              
  Lines          3075     3076       +1     
  Branches        359      359              
============================================
+ Hits           2013     2014       +1     
  Misses          924      924              
  Partials        138      138              

Impacted Files	Coverage Δ	Complexity Δ
...ava/seedu/medibook/logic/commands/FindCommand.java	90.00% <100.00%> (+0.52%)	10.00 <0.00> (ø)

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[wang-jun-hao]

lgtm