[whatwg/encoding] Editorial: Clean up gb18030 math (#63)

Please clean up the math for 4-byte sequences in the gb18030 decoder to [perform the three multiplications by constant exprressions and then adding the results](https://github.com/hsivonen/encoding-rs/blob/5668dc4b18bc6bab5a90b023b643e112c2fe5674/src/gb18030.rs#L143). This both helps readability and reduces [data dependencies](https://en.wikipedia.org/wiki/Data_dependency#Implications) if the spec text is transcribed to code.

Please clean up the math for 4-byte sequence in the gb18030 encoder to [use the `%` operator with constant expressions on the high-hand side](https://github.com/hsivonen/encoding-rs/blob/5668dc4b18bc6bab5a90b023b643e112c2fe5674/src/gb18030.rs#L302). This helps readability and reduces data dependencies if the spec text is transcribed to code.

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