Updated marshal to correct from_hex_12k implementation

Author: univta0001

docs/emu6502_web_bg.wasm

@@ -208,11 +208,11 @@ pub fn from_hex_12k<'de, D: Deserializer<'de>>(deserializer: D) -> Result<Vec<u8
     let result = from_hex(deserializer);
     if let Ok(ref value) = result
         && value.len() != 0x3000
-        && value.len() % 0x20000 != 0
+         && value.len() % (0x3000 * 8) != 0
     {
         return Err(Error::invalid_value(
             Unexpected::Seq,
-            &"Array should be 12K or multiple of 128k",
+            &"Array should be 12K or multiple of 96k",
         ));
     }
     result