Issue #1696: addresses a bug in plotting the intercept (#1698)

* Issue #1696: addresses a bug in plotting the intercept for time-varying-intercept

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

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Co-authored-by: esmail.ansari <esmail.ansari@hrblock.com>
Co-authored-by: Will Dean <57733339+williambdean@users.noreply.github.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: 4 people

pymc_marketing/mmm/mmm.py

@@ -1280,7 +1280,10 @@ def plot_components_contributions(
 
             ax.plot(
                 np.asarray(self.X[self.date_column]),
-                np.full(len(self.X[self.date_column]), intercept.mean().data),
+                np.full(
+                    len(self.X[self.date_column]),
+                    intercept.mean(["chain", "draw"]).data,
+                ),
                 color=f"C{i + 1}",
             )
             ax.fill_between(