[Session] Fix parameter names in WriteCheckSessionHandler

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -
minor #12448 [Session] Fix parameter names in WriteCheckSessionHandler (znerol)

This PR was submitted for the master branch but it was merged into the 2.5 branch instead (closes #12448).

Discussion
----------

[Session] Fix parameter names in WriteCheckSessionHandler

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Commits
-------

90e7830 [Session] Fix parameter names in WriteCheckSessionHandler