fix gate reverse

Author: edwardwawrzynek

src/main/kotlin/frc/robot/RobotContainer.kt

@@ -207,7 +207,9 @@ class RobotContainer {
         gate.defaultCommand = SensoredFixedGateSpeed(gate, {
             if (controller0.xButton) Constants.kGateSpeed else (
                 if (controller0.bButton) -Constants.kGateSpeed else (
-                    if (controller0.getBumper(kLeft)) Constants.kGateLoadSpeed else 0.0
+                    if (controller0.getBumper(kLeft)) Constants.kGateLoadSpeed else (
+                        if (controller0.getTriggerAxis(kLeft) >= Constants.kTriggerThresh) -Constants.kGateLoadSpeed else 0.0
+                    )
                 ))
         }, {
             /* only run in sensored mode if controller0 left bumper held */