Schedule table: replace ❌ icon to an eraser and change it's behavior

[flomonster]

Description

Today using the ❌ on the schedule table delete the path item wich can impact the pathfinding.
We should instead of removing the path item, clear schedule input (stop, schedule point, margin).
Since the button change its meaning we want to change the icon to an "eraser" icon

Acceptance criteria

• The ❌icon is replaced by an eraser
• Clicking on this button erases the information written for this line of the input table (arrival time, stopping time, margin, closed signal checkbox)
• Clicking on this button DOES NOT remove the point from the path list