pgsql: use static str for log & remove whitespaces

Removing the white spaces from the password message, as these can cause
issues with grepping commands querying log results, and also doesn't
show a consistent behavior among different environments.

Also replace function call with static str, as it wasn't needed there.

rust/src/pgsql/logger.rs

@@ -79,7 +79,7 @@ fn log_request(req: &PgsqlFEMessage, flags: u32) -> Result<JsonBuilder, JsonErro
             if flags & PGSQL_LOG_PASSWORDS != 0 {
                 js.set_string_from_bytes("password", payload)?;
             } else {
-                js.set_string(req.to_str(), "password log disabled")?;
+                js.set_string("password_message", "password_log_disabled")?;
             }
         }
         PgsqlFEMessage::SASLResponse(RegularPacket {