[FIX] do not initialize kernel object

Reviewer's Guide by Sourcery

The PR modifies the initialization of the MKDAChi2 class by changing how the kernel_transformer parameter is handled. Instead of creating a default MKDAKernel instance with no arguments, it now passes the MKDAKernel class itself as the default value, allowing users to initialize it with custom arguments when needed.

Updated class diagram for MKDAChi2 initialization

classDiagram
    class MKDAChi2 {
        - kernel_transformer: MKDAKernel
        + kernel_transformer: Class<Kernel>
        prior: float
        memory: Memory
        memory_level: int
    }
    class MKDAKernel {
    }
    class Memory {
        location: None
        verbose: int
    }
    MKDAChi2 --> MKDAKernel
    MKDAChi2 --> Memory
    note for MKDAChi2 "kernel_transformer is now a class reference, allowing custom initialization."

File-Level Changes

Change	Details	Files
Modified default parameter initialization in MKDAChi2 class constructor	Changed kernel_transformer default from instantiated MKDAKernel() to MKDAKernel class reference Enables passing custom arguments to kernel_transformer during initialization	`nimare/meta/cbma/mkda.py`

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#906	Fix the warning about MKDAKernel arguments being ignored due to premature initialization	✅

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neurostuff / NiMARE