Fix grain-direction rotation refusals
Correct a wrong-running grain at the panel's grain declaration instead of rotating it on the sheet.
A panel declared with grain cannot be rotated in the board layout.
Attempting to rotate a panel declared with grain is refused with the message that rotation is not allowed for that panel due to its grain direction.
A wrong-running grain must be corrected at the panel/finish grain declaration instead of by rotating the part on the sheet.