Remove already claimed check to match prize pool changes

[trmid]

The prize pool is now set to revert if a prize has already been claimed, this means that the claimer already catches these with the ClaimError event and no special treatment is needed.

[linear]

GEN-1233 [M-345] Prize claim reentrancy

[github-actions]

LCOV of commit 823eb79 during Tests with 100% Coverage #134

Summary coverage rate:
  lines......: 100.0% (76 of 76 lines)
  functions..: 100.0% (15 of 15 functions)
  branches...: no data found

Files changed coverage rate:
                                  |Lines       |Functions  |Branches    
  Filename                        |Rate     Num|Rate    Num|Rate     Num
  ======================================================================
  src/Claimer.sol                 | 100%     45| 100%     9|    -      0