index: prevent race by calling 'CustomInit' prior setting 'synced' flag

The 'm_synced' flag enables 'BlockConnected' events to be processed by
the index. If we set the flag before calling 'CustomInit', we could be
dispatching a block connected event to an uninitialized index child
class.

e.g. BlockFilterIndex, initializes the next filter position
inside 'CustomInit'. So, if `CustomInit` is not called prior receiving
the block event, the index will use 'next_filter_position=0' which
overwrites the first filter in disk.

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