SotBE 17: recognize speaker Bruce

While I looked for "unknown speakers" in an old version of the campaign,
in the meantime mattsc had changed the scenario to use a macro for the
enemy reinforcements (e5905f05).

Although I could use my spiffy new "whofield" magic comment here, Bruce
is the only general who speaks, so an old-fashioned "recognize" is more
appropriate.

data/campaigns/Son_Of_The_Black_Eye/scenarios/17_The_Human_Attack.cfg

@@ -336,6 +336,7 @@
         name=turn 19
 
         {HUMAN_REINFORCEMENTS Bruce}
+        # wmllint: recognize Bruce
 
         [message]
             speaker=Bruce