databases/cego: update 2.50.3 -> 2.50.4

• Optimization added to CegoPredDesc::match. Matcher is just created, if the match method is called, since it might occur, that the condition is evaluated be CegoDistCursor via CegoAttrCond
• Fix in CegoAttrComp::getMatcher, there was still missing star escape, which has been added to CegoPredDesc constructor. To avoid two same pieces of code, CegoQueryHelper::sql2Regex has been introduced