JavaFX: Do not hard-code Scene sizes.

* In order to allow dynamic filling of the eclipse views, don't set a
  fixed Scene size to allow dynamic resizing as required.

Issue-Ref: 3209
Issue-Url: https://af3-developer.fortiss.org/issues/3209


Signed-off-by: Alexander Diewald <diewald@fortiss.org>

org.fortiss.tooling.common.ui/src/org/fortiss/tooling/common/ui/javafx/.ratings

-AF3FXViewPart.java 9f63bcde312d81dca05514e0269aee9a5bd5e2a2 YELLOW
+AF3FXViewPart.java 9e119a36de6ab9e1a07cd416de0126a89514bd38 YELLOW

org.fortiss.tooling.common.ui/src/org/fortiss/tooling/common/ui/javafx/AF3FXViewPart.java

@@ -134,7 +134,7 @@ public abstract class AF3FXViewPart extends FXViewPart { // NO_UCD
 		if(!isCustomStyleSheetApplied) {
 			setNativeLook(root);
 		}
-		Scene scene = new Scene(root, 400, 400);
+		Scene scene = new Scene(root);
 		return scene;
 	}