tview: Suppress warnings about importing Axes3D

We don't use 3D projections, and if users have a system installed
matplotlib then this warning will spuriously fire every single time
tview starts.

Author: jpieper

utils/gui/moteus_gui/tview.py

@@ -38,6 +38,9 @@
 import sys
 import time
 import traceback
+import warnings
+warnings.filterwarnings(
+    "ignore", message="Unable to import Axes3D", category=UserWarning)
 import matplotlib
 import matplotlib.figure