RINEX input_rnxctr: correct the ephemeris set for GAL

[ourairquality]

Spotted this code that does not appear correct. The RINEX 3 spec details the code bits as follows so the current code checking bit 9 for a f/nav set seems wrong.

Bit 0 set: I/NAV E1-B
Bit 1 set: F/NAV E5a-I
Bit 2 set: I/NAV E5b-I
Bits 0 and 2 : Both can be set if the navigation messages were merged,
however, bits 0-2 cannot all be set, as the I/NAV and F/NAV messages contain different information
Bit 3 reserved for Galileo internal use
Bit 4 reserved for Galileo internal use
Bit 8 set: af0-af2, Toc, SISA are for E5a,E1
Bit 9 set: af0-af2, Toc, SISA are for E5b,E1
Bits 8-9 : exclusive (only one bit can be set)

Set 0 is used for I/NAV and set 1 for F/NAV. The ephemeris structure code slot has bit 8 set for E5a,E1 or bit 9 set for E5b,E1. F/NAV is for channel E5a-I, not channel E5b-I. For I/NAV on channel E1B neither bit 8 or 9 would be set. So checking bit 8 should distinguish F/NAV from I/NAV and when set the ephemeris should go to set 1.

Also bit 1 is expected to be set for F/NAV E5a-I so also use the F/NAV set in this case.