Fix BBC micro analog profile mux error

src/scripts/Profiles/6BIT_RGB_Analog/BBC_Micro.txt

@@ -1,6 +1,6 @@
 sampling7=5,5,5,5,5,5,5,0,8,12,0,0,0,45,18,45,18,255,50,0,255
 geometry7=156,26,480,256,576,288,3,4,1,4,12000000,768,5000,312,4,0,1
-sampling=2,2,2,2,2,2,2,0,6,5,0,1,0,45,18,45,18,255,50,0,255
+sampling=2,2,2,2,2,2,2,0,6,5,0,0,0,45,18,45,18,255,50,0,255
 geometry=176,29,640,256,768,288,1,2,1,8,16000000,1024,5000,312,4,0,0
 auto_switch=2
 palette_control=1