Restore image argument to Load10X_Spatial() for seurat5

[jasonratcliff]

The image argument appears to have been removed from Load10X_Spatial() upstream from the seurat5 development branch in a merge commit here. This PR fixes #7560 and resolves #7608 which note the following issues:

1. Checking is.null(x = image) evaluates to FALSE, raising an inheritance error from:
   • if (!inherits(x = image, what = "VisiumV1"))

This might be due to a namespace conflict with the standard generic graphics::image. When image is not set to NULL in the function scope, the check evaluates to FALSE given an existing method:

% Rscript --vanilla -e 'is.null(image)' -e 'image'
[1] FALSE
function (x, ...) 
UseMethod("image")
<bytecode: 0x14c0a71f8>
<environment: namespace:graphics>

2. Specifying an input to image (e.g., with a call to Read10X_Image) raises an unused argument error
   • The image argument is dot-forwarded to Read10X_h5(), which lacks the defined argument
     • See Load_10XSpatial() Error with CytAssist loading #7608

> Load10X_Spatial(data.dir = tempdir(), image = NULL)

Error in Read10X_h5(filename = file.path(data.dir, filename), ...) (preprocessing.R#534): unused argument (image = NULL)
Show stack trace

> names(formals(Read10X_h5))
[1] "filename"        "use.names"       "unique.features"

Note

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I am submitting this PR directly to the seurat5 branch from an up-to-date fork instead of the develop branch, given the issue appears to be localized to the v5 development branch. Hope that is alright!