Fix loader crash caused by missing zero padding of address strings

mythril/laser/ethereum/call.py

@@ -96,7 +96,7 @@ def get_callee_address(
         # attempt to read the contract address from instance storage
         try:
             callee_address = dynamic_loader.read_storage(
-                hex(environment.active_account.address.value), index
+                "0x{:040X}".format(environment.active_account.address.value), index
             )
         # TODO: verify whether this happens or not
         except:

mythril/laser/ethereum/state/account.py

@@ -64,7 +64,7 @@ class Storage:
                 storage[item] = symbol_factory.BitVecVal(
                     int(
                         self.dynld.read_storage(
-                            contract_address=hex(self.address.value),
+                            contract_address="0x{:040X}".format(self.address.value),
                             index=int(item.value),
                         ),
                         16,