Future-proof prior_linearized method call (#806)

* modified: pymc_marketing/mmm/tvp.py

* Update tvp.py

Changed Xs to X in prior_linearized( as per the change in pymc)

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---------

Co-authored-by: sangeedutta <sangeedutta@gmail.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Will Dean <57733339+wd60622@users.noreply.github.com>

pymc_marketing/mmm/tvp.py

@@ -161,7 +161,7 @@ def time_varying_prior(
         hsgp_dims = (dims[1], "m")
 
     gp = pm.gp.HSGP(m=[hsgp_kwargs.m], L=[hsgp_kwargs.L], cov_func=cov_func)
-    phi, sqrt_psd = gp.prior_linearized(Xs=X[:, None] - X_mid)
+    phi, sqrt_psd = gp.prior_linearized(X[:, None] - X_mid)
     hsgp_coefs = pm.Normal(f"{name}_hsgp_coefs", dims=hsgp_dims)
     f = phi @ (hsgp_coefs * sqrt_psd).T
     f = pt.softplus(f)