Removed cancel button from ImageJ plugin dialog

src/ImageJ/plugin-ij/src/main/java/net/leverjs/LeverscIJ.java

@@ -334,11 +334,9 @@ public class LeverscIJ implements PlugInFilter
     {
         GenericDialog gd = new GenericDialog("View in Figure:");
         gd.addNumericField("Figure Number: ", 1);
+        gd.hideCancelButton();
 
         gd.showDialog();
-        if ( gd.wasCanceled() )
-            return -1;
-        else
         return (int)gd.getNextNumber();
     }