Updating focal length and app params generator window to address issue with frame estimates

SynthDet/Assets/Scenes/MainScene.unity

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:99c3c9814f80c09e09b27cdfa7ef1299f6b891e9ef9ac3973fe48223dc9fabba
-size 11239
+oid sha256:c7a7c64a416618bb8b2c837218e1a04a9bf6861b7d5780f5596ec11e42209f41
+size 11242

SynthDet/Assets/Scripts/Editor/AppParamsGeneratorWindow.cs

@@ -269,7 +269,7 @@ public class AppParamsGeneratorWindow : EditorWindow
     }
 
     // A hand-tuned value that approximately corresponds to the frames per scale factor per orientation with 64 foreground objects.
-    const float k_EstimatedFramesPerCurriculumStepAtOneScale = 4.9f;
+    const float k_EstimatedFramesPerCurriculumStepAtOneScale = 4.2f;
     
     int EstimateTotalFrames()
     {