Fix Camera2D limits drawing

[arkology]

Camera2D limits drawing should not be affected by skew and rotation.
Discovered during #101427 (comment)

Before:

Godot_v4.4-beta3_win64_D03QmMH2ps.mp4

After:

godot.windows.editor.dev.x86_64_qTjKNvXSZU.mp4

[Lazy-Rabbit-2001]

what if the camera really needs to be rotated? e.g. rotated camera to make rotated visual effect for a level.
it makes sense to me to ban skew on camera, but it doesn't to disallow rotation 🤔
meanwhile, there is a fact that the limits rect is transformed as the camera rotates with rotate_camera(iirc) on. so disallowing this seems to be conflict against the feature..

[arkology]

what if the camera really needs to be rotated? e.g. rotated camera to make rotated visual effect for a level. it makes sense to me to ban skew on camera, but it doesn't to disallow rotation 🤔 meanwhile, there is a fact that the limits rect is transformed as the camera rotates with rotate_camera(iirc) on. so disallowing this seems to be conflict against the feature..

This PR doesn't break anything in that area (does not change actual behavior, only drawing). Reality is that rotated camera still stays in the same limits as unrotated camera. And this is another bug.

godot.windows.editor.dev.x86_64_9TJzepjNkl.mp4

[Lazy-Rabbit-2001]

Maybe it was me that didn't make you sense of what I had meant. I meant that when ignore_rotation is turned off, the rectangle of the limits in the game runtime will also be transformed. For example:

This will become

So if the limits rotation is fixed in the editor side, users cannot make sure the accurate boundary, which is inconsistent with what it runs like in the runtime and makes inconsistent and inaccurate sense to users.

[arkology]

I meant that when ignore_rotation is turned off, the rectangle of the limits in the game runtime will also be transformed.

If so, I think something is wrong with camera work, it should not be different in-editor and in-game.
But this is not in the scope of current PR, because with this PR camera limits drawn in the editor now match real camera limits in editor.

[akien-mga]

Thanks!