[orx-noise] Tidy up demos

Produce 720px wide images.
Use main() = application { for reduced indentation

orx-noise/src/jvmDemo/kotlin/rseq/DemoRseq2D01.kt

@@ -8,20 +8,18 @@ import org.openrndr.extra.noise.rsequence.rSeq2D
  * demonstrating 2D quasirandomly distributed points. The points are generated
  * using the R2 sequence and drawn as circles with a radius of 5.0.
  */
-fun main() {
-    application {
-        configure {
-            width = 720
-            height = 720
-        }
+fun main() = application {
+    configure {
+        width = 720
+        height = 720
+    }
 
-        program {
-            extend {
-                val points = (0 until 4000).map {
-                    rSeq2D(it) * 720.0
-                }
-                drawer.circles(points, 5.0)
+    program {
+        extend {
+            val points = (0 until 4000).map {
+                rSeq2D(it) * 720.0
             }
+            drawer.circles(points, 5.0)
         }
     }
-}
+}