Remove redundant text from console err msg

The client was displaying
	Error: UNAUTHENTICATED: incorrect 'password' rpc header value
from the StatusRuntimeException message.

Strip "UNAUTHENTICATED: " from the exception message string before
printing it.

cli/src/main/java/bisq/cli/CliMain.java

@@ -145,7 +145,7 @@ public static void main(String[] args) {
             exit(EXIT_FAILURE);
         } catch (StatusRuntimeException ex) {
             Throwable t = ex.getCause() == null ? ex : ex.getCause();
-            err.println("Error: " + t.getMessage());
+            err.println("Error: " + t.getMessage().replace("UNAUTHENTICATED: ", ""));
             exit(EXIT_FAILURE);
         }
     }