Improve compatibility with GLES back-end

orx-fx/src/jvmDemo/kotlin/DemoBlur01.kt

@@ -1,7 +1,6 @@
 import org.openrndr.application
 import org.openrndr.color.ColorRGBa
 import org.openrndr.draw.*
-import org.openrndr.extensions.SingleScreenshot
 import org.openrndr.extra.fx.blur.*
 import org.openrndr.math.Polar
 import kotlin.math.sin

orx-fx/src/jvmDemo/kotlin/DemoDitherLumaHalftone01.kt

@@ -2,7 +2,6 @@ import org.openrndr.application
 import org.openrndr.draw.createEquivalent
 import org.openrndr.draw.loadImage
 import org.openrndr.extra.fx.dither.LumaHalftone
-import org.openrndr.math.mod_
 
 fun main() {
     application {

orx-fx/src/jvmDemo/kotlin/DemoFluidDistort01.kt

@@ -16,11 +16,6 @@ fun main() {
             checkers.size = 64.0
             checkers.apply(emptyArray(), image)
 
-            if (System.getProperty("takeScreenshot") == "true") {
-                extend(SingleScreenshot()) {
-                    this.outputFile = System.getProperty("screenshotPath")
-                }
-            }
             extend {
                 fd.blend = mouse.position.x/width
                 fd.apply(image, distorted)