Encode connection URL to database

- If you have a database password that contains characters like `#` or `*`, sqlx
will error about a InvalidPort, this is due to not encoding the url.
[See issue on sqlx](https://github.com/launchbadge/sqlx/issues/1624).
- Removed useless statements.

db/db-sqlx-maria/Cargo.toml

@@ -13,6 +13,7 @@ async-trait = "0.1.51"
 db-core = {path = "../db-core"}
 futures = "0.3.15"
 sqlx = { version = "0.5.13", features = [ "runtime-actix-rustls", "mysql", "time", "offline" ] }
+urlencoding = "2.1.2"
 
 [dev-dependencies]
 actix-rt = "2"