Fixed GPLQ spec, all rules passing (#3822)

Co-authored-by: Michael George <michael@certora.com>
Co-authored-by: Nick Armstrong <nick@certora.com>
Co-authored-by: Michael George <mdgeorge@cs.cornell.edu>
Co-authored-by: Aleksander Kryukov <firealexkryukov@gmail.com>
Co-authored-by: Hadrien Croubois <hadrien.croubois@gmail.com>

certora/scripts/passes/verifyERC20FlashMint.sh

@@ -6,6 +6,5 @@ certoraRun \
     certora/harnesses/ERC20FlashMintHarness.sol \
     certora/harnesses/IERC3156FlashBorrowerHarness.sol \
     --verify ERC20FlashMintHarness:certora/specs/ERC20FlashMint.spec \
-    --solc solc \
     --optimistic_loop \
     $@