cli: Set a working `EDITOR` env var in tests

Previously, commands would just fail. Now it runs the `true` command
that always returns success.

radicle-cli/tests/commands.rs

@@ -46,6 +46,7 @@ fn test<'a>(
         .env("RAD_HOME", home.to_string_lossy())
         .env("RAD_PASSPHRASE", "radicle")
         .env("RAD_SEED", RAD_SEED)
+        .env("EDITOR", "true")
         .env("TZ", "UTC")
         .env("LANG", "C")
         .env(radicle_cob::git::RAD_COMMIT_TIME, "1671125284")