tokenlist: made 'btc' uppercase

src/util/token_list.rs

@@ -97,7 +97,7 @@ impl DrkTokenList {
 
     pub fn symbol_from_id(&self, id: jubjub::Fr) -> Result<Option<String>> {
         if id.to_string() == "0x01300f9bce0f9ba7168dc001a67bcbda3a5bf4bdb4c56ae900fe4698cee9a7bd" {
-            return Ok(Some("btc".to_string()));
+            return Ok(Some("BTC".to_string()));
         }
 
         Ok(self