LibCrypto: Cleanup unused variables in UnsignedBigInteger::divided_by

These were likely cut-and-paste artifacts from
UnsignedBigInteger::multiplied_by; not caught by the "unused-varible".

NOTE: making this change in a separate commit than shift_left, since
it is logically unrelated.

Libraries/LibCrypto/BigInt/UnsignedBigInteger.cpp

@@ -521,11 +521,6 @@ FLATTEN UnsignedDivisionResult UnsignedBigInteger::divided_by(UnsignedBigInteger
         return UnsignedDivisionResult { quotient, remainder };
     }
 
-    UnsignedBigInteger temp_shift_result;
-    UnsignedBigInteger temp_shift_plus;
-    UnsignedBigInteger temp_shift;
-    UnsignedBigInteger temp_minus;
-
     UnsignedBigIntegerAlgorithms::divide_without_allocation(*this, divisor, quotient, remainder);
 
     return UnsignedDivisionResult { quotient, remainder };