htpd: increase MIN_FREQHOLD by 3

This means we'll start correcting frequency ~5 minutes after start,
not ~3.5 ones.

With previos settings I still often see largish ~0.7s initial offsets
only about 1/2 corrected before frequency correction kicks in,
resulting in ~200ppm "correction" which is then slowly undone.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

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