ConPTY: when pasting, replace "\r\n" with "\n"

On Windows, most copying-and-pasting will use CRLF vs. LF -- this means
that pasting from Windows *into* Alacritty will likely end-up with
duplicated newlines, as Alacritty will send *both* '\r' and '\n'.

This change replaces "\r\n" with "\n" when pasting, such that these
duplicated newlines do not appear.

See: alacritty#2324 (comment)

alacritty/src/event.rs

@@ -678,7 +678,7 @@ impl<'a, N: Notify + 'a, T: EventListener> input::ActionContext<T> for ActionCon
             }
         } else if self.terminal().mode().contains(TermMode::BRACKETED_PASTE) {
             self.write_to_pty(&b"\x1b[200~"[..]);
-            self.write_to_pty(text.replace("\x1b", "").into_bytes());
+            self.write_to_pty(text.replace("\x1b", "").replace("\r\n", "\n").into_bytes());
             self.write_to_pty(&b"\x1b[201~"[..]);
         } else {
             // In non-bracketed (ie: normal) mode, terminal applications cannot distinguish