fixes parsing problem in glow/dropshadow-type filters

dropshadow: onTop=0, passes=UB5
glow: onTop=0, passes=UB5
bevel: onTop=UB1, passes=UB4
gradientbevel: onTop=UB1, passes=UB4
gradientglow: onTop=UB1, passes=UB4
fixed typo
initialize filters passed via symbol