Is one of the myriad sports-talk radio stations in town beginning to blink in their eyeball-to-eyeball-to-eyeball-to-eyeball battle?Clear Channel, the communications giant, swung the layoff ax across the country today, and it hit notably in Houston.The biggest names: Brad Davies and Craig Roberts of the 790 KBME morning show. (On the non-sports side, Donna McCoy of Sunny 99.1 is gone; dentists' offices everywhere sob.)Replacing Davies and Roberts will be even more of the (not so enjoyable)