Tweak environment tonemapping and adjustments for Godot 3.4

- Use the new ACES Fitted tonemapping for physically correct behavior
  of glowing lights.
- Decrease overall saturation and contrast for a less jarring appearance.

level/geometry/environment.tres

@@ -13,8 +13,8 @@ fog_transmit_curve = 1.03526
 fog_height_enabled = true
 fog_height_max = -200.0
 fog_height_curve = 0.812252
-tonemap_mode = 2
-tonemap_exposure = 1.2
+tonemap_mode = 4
+tonemap_exposure = 3.0
 tonemap_white = 6.0
 auto_exposure_scale = 0.08
 auto_exposure_min_luma = 0.01
@@ -34,6 +34,4 @@ glow_hdr_threshold = 0.9
 glow_hdr_luminance_cap = 3.0
 glow_bicubic_upscale = true
 adjustment_enabled = true
-adjustment_brightness = 1.48
-adjustment_contrast = 1.05
-adjustment_saturation = 1.61
+adjustment_saturation = 1.4