pkg/obfuscate: 35 is a valid CC IIN

[ajgajg1134]

What does this PR do?

Remove an unnecessary / incorrect check in CC detection. This doesn't change the existing behavior it just cleans the code up (note that in the if above my change that 35 is already included).
And this is correct according to the link in the code, some JCB credit cards have an IIN of 35.

Motivation

I was porting this code to rust for this pr (DataDog/libdatadog#117) And thanks to rust match clause checking it helpfully pointed out that the previous if here already includes 35 as a valid Issuer Identification Number(IIN).

Describe how to test/QA your changes

Already well covered by unit tests :)

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