Missing return in extractConfigValueByKey

[PaulZC]

As observed by @adamgarbo - thanks!

There is a missing return (true); right here:

SparkFun_u-blox_GNSS_v3/src/u-blox_GNSS.h

Lines 502 to 503 in f95988e

	*value = (int8_t)extractSignedChar(pkt, ptr);
	break;