APM_Control: allow for smaller minimum tconst

libraries/APM_Control/AP_PitchController.cpp

@@ -307,8 +307,8 @@ int32_t AP_PitchController::get_servo_out(int32_t angle_err, float scaler, bool
 	float rate_offset;
 	bool inverted;
 
-    if (gains.tau < 0.1f) {
+    if (gains.tau < 0.01f) {
-        gains.tau.set(0.1f);
+        gains.tau.set(0.01f);
     }
 
     rate_offset = _get_coordination_rate_offset(aspeed, inverted);

libraries/APM_Control/AP_RollController.cpp

@@ -221,8 +221,8 @@ int32_t AP_RollController::get_rate_out(float desired_rate, float scaler)
 */
 int32_t AP_RollController::get_servo_out(int32_t angle_err, float scaler, bool disable_integrator)
 {
-    if (gains.tau < 0.1f) {
+    if (gains.tau < 0.01f) {
-        gains.tau.set(0.1f);
+        gains.tau.set(0.01f);
     }
 	
 	// Calculate the desired roll rate (deg/sec) from the angle error