Tune the corner guard and persist the eyedropper toggle on the player

Dial corner guard to 70 degrees / 0.7 fraction and serialize the
pipetteAlbedoFromScreen toggle on the player prefab.

Assets/Prefabs/Player.prefab

@@ -467,6 +467,7 @@ MonoBehaviour:
   dilateShader: {fileID: 0}
   packMsShader: {fileID: 0}
   pipette: 0
+  pipetteAlbedoFromScreen: 0
   spray: 0
   sprayDots: 24
   sprayDotSizeMin: 0.05
@@ -501,6 +502,9 @@ MonoBehaviour:
   brushRotation: 0
   paintOnMoveOnly: 1
   paintInterval: 0
+  cornerGuard: 1
+  cornerGuardAngle: 70
+  cornerGuardMaxFraction: 0.7
   previewMode: 2
   previewOpacity: 1
   textureSize: 1024