Fix typo in @dougal/binary

Resolve "Automatic event detection fault: soft start on every shot during line"

Closes #337

See merge request wgp/dougal/software!61

lib/modules/@dougal/binary/classes.js

@@ -693,7 +693,7 @@ class DougalBinaryChunkSequential extends ArrayBuffer {
 	getRecord (index) {
 		if (index < 0 || index >= this.jCount) throw new Error(`Invalid record index: ${index}`);
 
-		const arr = [thid.udv, this.i, this.j0 + index * this.Δj];
+		const arr = [this.udv, this.i, this.j0 + index * this.Δj];
 
 		for (let m = 0; m < this.ΔelemCount; m++) {
 			const values = this.Δelem(m);