fix(sdk): Remove temporary ec salt value (#228)

Author: dmihalcik-virtru

sdk/src/main/java/io/opentdf/platform/sdk/TDF.java

@@ -37,7 +37,7 @@
  */
 public class TDF {
 
-    public static final byte[] GLOBAL_KEY_SALT = "salt".getBytes(StandardCharsets.UTF_8);
+    public static final byte[] GLOBAL_KEY_SALT = null;
     private static final String EMPTY_SPLIT_ID = "";
     private static final String TDF_VERSION = "4.3.0";
     private static final String KEY_ACCESS_SECHMA_VERSION = "1.0";