[processing] Fix restoring parameter values from batch panel load button

Fixes #18236

(cherry-picked from 81d536)

python/plugins/processing/gui/BatchPanel.py

@@ -159,7 +159,7 @@ def load(self):
                     if param.isDestination():
                         continue
                     if param.name() in params:
-                        value = params[param.name()].strip("'")
+                        value = eval(params[param.name()])
                         wrapper = self.wrappers[row][column]
                         wrapper.setValue(value)
                     column += 1