Fix a corner case that I noticed with the AR5416 (and it's currently

crappy 802.11n performance, sigh.)

With the AR5416, aggregates need to be limited to 8KiB if RTS/CTS is
enabled.  However, larger aggregates were going out with RTSCTS enabled.
The following was going on:

* The first buffer in the list would have RTS/CTS enabled in
  bf->bf_state.txflags;
* The aggregate would be formed;
* The "copy over the txflags from the first buffer" logic that I added
  blanked the RTS/CTS TX flags fields, and then copied the bf_first
  RTS/CTS flags over;
* .. but that'd cause bf_first to be blanked out! And thus the flag
  was cleared;
* So the rest of the aggregate formation would run with those flags
  cleared, and thus > 8KiB aggregates were formed.

The driver is now (again) correctly limiting aggregate formation for
the AR5416 but there are still other pending issues to resolve.

Tested:

* AR5416, STA mode

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