Bug fix for loading boolean settings (#10826) (#10828)

- Do not just cast to bool
- The string "False" casts to True in this case
- Use the function that supports strings

(cherry picked from commit 8cb808f613)

Co-authored-by: Oliver <oliver.henry.walters@gmail.com>

src/backend/InvenTree/InvenTree/config.py

@@ -223,6 +223,11 @@ def do_typecast(value, type, var_name=None):
     elif type is dict:
         value = to_dict(value)
 
+    # Special handling for boolean typecasting
+    elif type is bool:
+        val = is_true(value)
+        return val
+
     elif type is not None:
         # Try to typecast the value
         try: