Remove the WHERE_LIKELIHOOD bit, as it does not seem to effect any result.

FossilOrigin-Name: 1cbe7a0883e081611a50524517d70e0b6c5199d2

src/whereInt.h

@@ -458,4 +458,3 @@ struct WhereInfo {
 #define WHERE_AUTO_INDEX   0x00004000  /* Uses an ephemeral index */
 #define WHERE_SKIPSCAN     0x00008000  /* Uses the skip-scan algorithm */
 #define WHERE_UNQ_WANTED   0x00010000  /* WHERE_ONEROW would have been helpful*/
-#define WHERE_LIKELIHOOD   0x00020000  /* A likelihood() is affecting nOut */