Increase the navigation depth (currently only 28)

I'm using code navigation (alt+left/right) to follow function calls, most of the time after digging the code using F2 "go to function definition". Unfortunately, it is impossible to get back to the original position if the depth is larger than 28.  It won't cost much to switch that to e.g 127 or 255.

This problem has been reported here already: https://forum.qt.io/topic/101242/how-to-increase-a-maximum-number-of-steps-for-go-back-command-in-the-qt-creator-interface-a-maximum-number-of-steps-by-default-is-not-enough/8

Thx!

Cyril