refactor: remove redundant cast - CtRolePathElement.java

[zielint0]

Remove redundant cast from CtElement to CtElement.

Checker: Redundant type cast
Reports unnecessary cast expressions.

This is also SonarQube fix - Remove this unnecessary cast to "CtIf".

[monperrus]

@zielint0 could you add a checkstyle rule so that redundant casts now fail the build? Thanks.

[zielint0]

@zielint0 could you add a checkstyle rule so that redundant casts now fail the build? Thanks.

I briefly checked a list of possible Checkstyle violations and it looks that is it beyond Checkstyle.

I found it using IDEA Code Inspection (Redundant type cast).