Fix comparison of Code Action edit lengths

This happened to work because we always produce a single edit but this
is obviously dubious.

editors/code/src/commands/cargo_watch.ts

@@ -212,7 +212,7 @@ export class CargoWatchProvider
             const leftEditEntries = left.edit.entries();
             const rightEditEntries = right.edit.entries();
 
-            if (leftEditEntries.length !== leftEditEntries.length) {
+            if (leftEditEntries.length !== rightEditEntries.length) {
                 return false;
             }