[Merton] Don't show total for current year ggw modification

[MorayMySoc]

Try removing line showing total for current year for ggw when modifying a subscription to see if useful for making what the information clearer.

https://mysocietysupport.freshdesk.com/a/tickets/6331

[skip changelog]

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.64%. Comparing base (70da206) to head (774ada8).
⚠️ Report is 28 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5759      +/-   ##
==========================================
- Coverage   82.65%   82.64%   -0.01%     
==========================================
  Files         455      455              
  Lines       35538    35538              
  Branches     5787     5787              
==========================================
- Hits        29374    29371       -3     
- Misses       4473     4475       +2     
- Partials     1691     1692       +1     

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