Typo in FieldMask fixed

[cezarykluczynski]

This is a fix for field GEOMETRY_LOCATION_LNG from FieldMask enum. Google Place API was unable to recognize lon. After changing to lng it works fine.

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[cezarykluczynski]

@googlebot I signed it!

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[coveralls]

Coverage remained the same at 73.893% when pulling b00f2f3 on cezarykluczynski:lng-typo-fix-field-mask into 5776021 on googlemaps:master.

[jpoehnelt]

LGTM, Thanks!