chore!: Flip default over to no-change

So rebases and whatnot are no longer modified

BREAKING CHANGE: Rebases and cherry picks will not have relates-to or
                 authors changed on them

Author: PurpleBooth

git-mit-config/src/cli/app.rs

@@ -110,7 +110,7 @@ pub enum Mit {
         #[clap(
             index = 1,
             env = "GIT_MIT_SET_NON_CLEAN_BEHAVIOUR",
-            default_value = "add-to"
+            default_value = "no-change"
         )]
         behaviour: BehaviourOption,
     },