Fix incorrect assignment operator in function argument

[Copilot]

Addresses review feedback on #134 regarding incorrect R syntax in the france_example_02.R file.

Changes

• Fixed spatial_extent <- list( to spatial_extent = list( in p$load_collection() call

In R, <- is for variable assignment while = is required for named function arguments:

# Before (incorrect)
datacube_crop <- p$load_collection(
  id = "sentinel-s2-l2a-cogs",
  spatial_extent <- list(  # Wrong operator
    west = ...,
    ...
  )
)

# After (correct)
datacube_crop <- p$load_collection(
  id = "sentinel-s2-l2a-cogs",
  spatial_extent = list(  # Correct operator
    west = ...,
    ...
  )
)

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