PyQt5->6: Update Exec function name

Author: ToveRumar

examples/aideck/fpv.py

@@ -286,4 +286,4 @@ def closeEvent(self, event):
     appQt = QtWidgets.QApplication(sys.argv)
     win = MainWindow(URI)
     win.show()
-    appQt.exec_()
+    appQt.exec()

examples/multiranger/multiranger_pointcloud.py

@@ -361,4 +361,4 @@ def set_measurement(self, measurements):
     appQt = QtWidgets.QApplication(sys.argv)
     win = MainWindow(URI)
     win.show()
-    appQt.exec_()
+    appQt.exec()