R1:1cc04fb83cd5

Explicitly cast "limit" (page size) API parameter to int

Summary:
Do not throw an exception when the `limit` (page size) Conduit API parameter is a float but explicitly convert to int.
As an admin, I am not interested in having invalid user-committed query data trigger an error in the server logs.

```
ERROR 8192: Implicit conversion from float to int loses precision at [/var/www/html/phorge/phorge/src/view/control/AphrontCursorPagerView.php:76]
```

Closes T15810

Test Plan: Call…