Display storage variables even if source does not match perfectly

[chriseth]

For debugging existing contracts compiled with old compiler versions, it might make sense to use a given source code, even though the bytecode on chain does not match perfectly. This could be very useful to at least display storage variables correctly (local variables and source references will not work).

[Aniket-Engg]

This can be done by improving this check: https://github.com/ethereum/remix/blob/979db8511b788adf34b265ddc45215bbcc525f5c/remix-lib/src/sourceLocationTracker.js#L73