This is fix for jira 2061
Layer height is double and may has small difference, which
influence total layer number when support is enabled.
Should use int data and consider EPSION when calculate total
layer number.
Signed-off-by: salt.wei <salt.wei@bambulab.com>
Change-Id: I1bb6c89f2afd162d2d7e7dcff4a9d6a00b94dab3