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#Ruby, 55 49 bytes
Try it online!
-6 bytes from @MartinEnder
->a{%w"Blinky Inky Pinky Clyde"-(a*''=~/-/?[]:a)}
Ruby arrays can undergo set subtraction, making it very easy to remove the appropriate ghosts.
#Ruby, 5555 49 bytes
Try it online!Try it online!
->a{%w"Blinky Inky Pinky Clyde"-(a.grep(a*''=~/-/)==[]?a:[]:a)}
#Ruby, 55 bytes
->a{%w"Blinky Inky Pinky Clyde"-(a.grep(/-/)==[]?a:[])}
