Fix behaviour of internal property

The attribute 'enterprise' in conanfile.py was incorrectly named and has been renamed to 'internal'.
This revision ensures that options are accessed correctly to avoid potential issues in usage.

Contributes to CURA-10831

conanfile.py

@@ -86,7 +86,7 @@ class CuraConan(ConanFile):
 
     @property
     def _internal(self):
-        return self.options.enterprise in ["True", 'true']
+        return self.options.internal in ["True", 'true']
 
     @property
     def _app_name(self):