[BUG] data in `Profile1D` export is not reset between 2 simulations

[RemDelaporteMathurin]

Describe the bug
I've noticed that using a single Profile1D object for two consecutive simulations doesn't reset the data (.t and .data attributes)

To Reproduce

1. Run a first simulation with a profile 1D export
2. Check the length of the .data attribute of the export object
3. Run the simulation again
4. Check the length again (should be double)

Expected behavior
The data should be wiped upon calling initialise()