use evaluate and compute more consistently

workers/evaluate.js

@@ -17,7 +17,7 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 importScripts("./lexer.js", "parser.js", "./math.js")
 
 addEventListener("message", (message) => {
-	if (message.data.command === "compute") {
+	if (message.data.command === "evaluate") {
 		const expr = message.data.expr;
 		const modulus = BigInt(message.data.modulus);
 		const result = evaluate(expr, modulus);