Flip and rotate are break Bezier geometry for circuit connections

To reproduce:
 - Create a circuit with a gate and an output port
 - Connect gate output pin to the output port
 - Change connection style to Bezier and choose it a distinctive shape.
 - Select everything and flip horizontally.

Observed behaviour:
 - Bezier control point at the gate pin is moved to incorrect position.

This happens because the pin gets flipped AFTER the control points are repositioned. As a result the control point is recalculated again.

A possible solution is to change connection style to "locked" before transformations, and restore afterwards.