default datastore path to be ~/.local/darkfi/ for darkirc and tau

bin/darkirc/src/settings.rs

@@ -54,7 +54,7 @@ pub struct Args {
     pub config: Option<String>,
 
     /// Sets Datastore Path
-    #[structopt(long, default_value = "~/.darkirc")]
+    #[structopt(long, default_value = "~/.local/darkfi/darkirc")]
     pub datastore: String,
 
     /// JSON-RPC listen URL

bin/tau/taud/src/settings.rs

@@ -40,7 +40,7 @@ pub struct Args {
     pub rpc_listen: Url,
 
     /// Sets Datastore Path
-    #[structopt(long, default_value = "~/.tau")]
+    #[structopt(long, default_value = "~/.local/darkfi/tau")]
     pub datastore: String,
 
     #[structopt(flatten)]