Fix undefined error in FullURLDecode

[zoeyfyi]

FullURLDecode.js doesn't work since c was undefined, this PR resolves this issue.

Having played with it a little I am unsure if the script is even necessary. @luisfontes19, do you have an example where the behavior of your script differs from the existing URLDecode.js script?

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3.5% Duplication

[luisfontes19]

Thanks for that.

You're right... It seems to not be needed as the decodeURIComponent from the default script also decodes these chars... Should have tested it first...