Fix typo of numeric constant

[tombsar]

The constant in function magnetometer should probably be 32767.0 (2^15-1) to match accelerometer (line 434), not 32676.0.

[coveralls]

Pull Request Test Coverage Report for Build 23

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 65.152%

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Totals
Change from base Build 22:	0.0%
Covered Lines:	43
Relevant Lines:	66

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💛 - Coveralls

[Gadgetoid]

I'm going to go out on a limb and say you're probably right 😆 Good spot, thank you!