Fix t/ prefix not working for editpolicy command

[yatbun]

Fix #108

[codecov-commenter]

Codecov Report

Merging #140 (3379fed) into master (86c8d99) will decrease coverage by 0.13%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master     #140      +/-   ##
============================================
- Coverage     51.49%   51.35%   -0.14%     
  Complexity      506      506              
============================================
  Files           105      105              
  Lines          2206     2212       +6     
  Branches        262      264       +2     
============================================
  Hits           1136     1136              
- Misses         1011     1017       +6     
  Partials         59       59              

Impacted Files	Coverage Δ
...logic/parser/contact/EditContactCommandParser.java	92.30% <ø> (ø)
...a/logic/parser/policy/EditPolicyCommandParser.java	0.00% <0.00%> (ø)

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[meerian]

LGTM!