[orx-filters] Set shader parameter to null in Filter constructors

orx-fx/src/commonMain/kotlin/blur/LaserBlur.kt

@@ -31,7 +31,7 @@ private class LaserBlurPass : Filter(mppFilterShader(fx_laser_blur, "laser-blur"
 }
 
 @Description("Laser blur")
-class LaserBlur : Filter1to1() {
+class LaserBlur : Filter1to1(null) {
     @Vector2Parameter("center", order = 0)
     var center = Vector2.ZERO
 

orx-fx/src/commonMain/kotlin/composite/CompositeFilter.kt

@@ -24,7 +24,7 @@ class CompositeFilter<F0 : Filter, F1 : Filter>(
     private val firstParameters: F0.() -> Unit,
     private val secondParameters: F1.() -> Unit,
     private val useIntermediateBuffer: Boolean = false
-) : Filter() {
+) : Filter(null) {
     private var intermediate: ColorBuffer? = null
 
     override fun apply(source: Array<ColorBuffer>, target: Array<ColorBuffer>, clip: Rectangle?) {

orx-fx/src/commonMain/kotlin/distort/FluidDistort.kt

@@ -18,7 +18,7 @@ private class FluidDistortFilter : Filter(mppFilterShader(fx_fluid_distort, "flu
     }
 }
 
-class FluidDistort : Filter1to1() {
+class FluidDistort : Filter1to1(null) {
     var blend: Double = 1.0
 
     var outputUV = false