Use QtApplication instead of Application

In live code it doesn't cause problems, but the static checker found it

1 files changed, 1 insertions, 0 deletions

diff --git a/cura/PlatformPhysics.py b/cura/PlatformPhysics.py
index d084c0dbf4..a411478b16 100755
--- a/cura/PlatformPhysics.py
+++ b/cura/PlatformPhysics.py
@@ -17,6 +17,7 @@ from cura.Scene import ZOffsetDecorator
 
 import random  # used for list shuffling
 
+
 class PlatformPhysics:
     def __init__(self, controller, volume):
         super().__init__()