Removed edge constraints in FreeFlying mode

[patrykantosz]

What does this PR do?

This PR removes the edge constraints in FreeFlying mode. Without this PR, the camera rotation in FreeFlying mode is limited by the screen size. If the cursor reaches the screen edge, the camera becomes blocked in that plane. This is due to the use of the GetSystemCursorPositionNormalized function, which returns the cursor position in normalized screen space. This is useful for the ThirdPerson mode, but limits the FreeFlying mode. With this PR, the camera can rotate freely along the X and Y axes without limitations, similar to the O3DE Fly Input Camera.

---

How was this PR tested?

By using RobotecSpectatorCamera in both ThirdPerson and FreeFlying modes.

---

Screenshots / Logs / Supporting Evidence (if applicable)

NA

---

Committer Checklist

Please confirm the following before marking this PR as ready for review:

• Code changes are well-documented
• Tests have been added or updated
• Code owners file and CI config were updated if new Gem was added
• The code is formatted according to the project's style guide
• The version number has been updated according to the contributing guidelines