fix: prevent removing corner of a rectangle when lockRectangles is used

[AnJ-K]

Added a simple check, similar to the one just below for hiding intermediate handles.

deck.gl-community/modules/editable-layers/src/edit-modes/modify-mode.ts

Lines 172 to 177 in b67a0b1

	const feature = props.data.features[featureIndex];
	const canAddPosition = !(
	props.modeConfig?.lockRectangles && feature?.properties.shape === 'Rectangle'
	);
	if (canAddPosition) {

When lockRectangles: true it is no longer possible to click on a corner of a rectangle to remove it.