Changed the Vibration Check Alt to 2

Change means the when the UAV alt <=2m then vibration checking will be
switched off.
It was noted that it was set at 0m, it should have been 1m.
Also changed the Vibration Graph to say >2m.
Will push through and make live as it was noted on the group as an
error.
Merge pull request #4 from TheQuestor/Increase_Vibration_Check_Alt

Changed the Vibration Check Alt to 2