vlib,cgen: cleanup array inits using `.repeat() instead of new init syntax

vlib/crypto/aes/aes_cbc.v

@@ -30,7 +30,7 @@ fn new_aes_cbc(b AesCipher, iv []byte) AesCbc {
 		b:          b,
 		block_size: b.block_size(),
 		iv:         iv.clone(),
-		tmp:        [byte(0)].repeat(b.block_size()),
+		tmp:        []byte{len:(b.block_size()),}
 	}
 }
 

vlib/crypto/aes/cypher_generic.v

@@ -9,8 +9,8 @@ module aes
 fn new_cipher_generic(key []byte) AesCipher {
 	n := key.len + 28
 	mut c := AesCipher{
-		enc: [u32(0)].repeat(n)
-		dec: [u32(0)].repeat(n)
+		enc: []u32{len:(n)}
+		dec: []u32{len:(n)}
 	}
 	expand_key_generic(key, mut c.enc, mut c.dec)
 	return c