fixed docker for drawing_from_input

Dockerfile

@@ -26,6 +26,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
         zsh \
         zsh-syntax-highlighting \
         libarchive-tools \
+        libxcb-cursor0\
         python3-python-qt-binding 
         
 # qt-binding is a really unnecessary 300MB, but i don't want
@@ -77,4 +78,5 @@ RUN conda config --add channels conda-forge
 RUN conda install -y casadi opencv
 RUN conda install --solver=classic -y pinocchio -c conda-forge
 RUN pip install matplotlib meshcat ur_rtde argcomplete \
-                qpsolvers ecos example_robot_data meshcat_shapes
+                qpsolvers ecos example_robot_data meshcat_shapes \
+                pyqt6