fix incorrect auto-filling of default E, tau, k parameter lengths in SCPCM

[SpatLyu]

This PR fixes a critical bug in the auto-filling (recycling) logic for the embedding dimension (E), spatial lag step (tau), and number of neighbors (k) parameters in the Spatially Convergent Partial Cross Mapping (SCPCM) method.

The new logic intelligently handles parameter expansion based on the input length:

• Length 1: The single value is applied to all variables (cause, effect, and all controls).
• Length 2: The first value is assigned to cause and effect; the second value is recycled for all controls. (Highly useful for setting different embedding dimensions for target vs. control variables).
• Length ≥ 3: The first two values are assigned to cause and effect; the remaining values are recycled specifically for the controls.