test(end-to-end): use pythagoras as default era value

Author: dlachaume

mithril-test-lab/mithril-end-to-end/src/main.rs

@@ -76,7 +76,7 @@ pub struct Args {
     mithril_run_interval: u32,
 
     /// Mithril era to run
-    #[clap(long, default_value = "thales")]
+    #[clap(long, default_value = "pythagoras")]
     mithril_era: String,
 
     /// Mithril next era to run