Remove special chars from pw gen.

Apparently some java libs dont handle this properly

central/src/keycloak.rs

@@ -256,7 +256,7 @@ fn generate_secret() -> String {
     use rand::Rng;
     const CHARSET: &[u8] = b"ABCDEFGHIJKLMNOPQRSTUVWXYZ\
                             abcdefghijklmnopqrstuvwxyz\
-                            0123456789)(*&^%$#@!~";
+                            0123456789";
     const PASSWORD_LEN: usize = 30;
     let mut rng = rand::thread_rng();