Safe Home travel speed slow

[SimonGolding]

I have just used a new copy of marlin 1.1.0 RC6 running on a Prusa i3 and found an issue with safe homing and auto levelling

Basically it would home X and Y at the correct speed then move to the middle of the bed at the speed for the Z axis which was really slow. This also affect G29 auto level (Im using an inductive probe) making it very slow.

I have made two changes to the code that have corrected the issue Marlin_main.cpp

Line 1646: feedrate = xy_travel_speed;
changed to feedrate = XY_TRAVEL_SPEED;

Not sure if this has any affect infact it looks like the var xy_travel_speed is no longer used once replaced with this constant.

I also modified line 1537 of marlin_main.cpp by adding

float oldFeedRate = feedrate;

at the beginning of the function then restored the feedrate at the end of the function.

Thanks
Simon

[thinkyhead]

The saving and restoring of the feed rate makes sense, so I've added that to a few functions in PR #4080.

As I look at the code, I see that xy_travel_speed is initialized to XY_TRAVEL_SPEED but it is meant to be overridden by G29 Snn (for Automatic Bed Leveling). If you leave off the S parameter, it is set to XY_TRAVEL_SPEED. So it should be fine to leave feedrate = xy_travel_speed in place.

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