Instantiate inertial->distorted for strahlkorper_in_different_frame

[geoffrey4444]

Proposed changes

For ringdown, we will need to transform Strahlkorpers from the ringdown inertial frame to the ringdown distorted frame. But strahlkorper_in_different_frame() currently assumes the initial frame is the grid frame. This PR adds support for transforming from the inertial frame to the distorted frame.

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Further comments

[knelli2]

Couple small things. You can squash directly

[knelli2]

Not a change request because you're just copying what was already done in the file, but these should probably be converted to ERRORs at some point.