Rename --display to --display-id

The option is named "display id" everywhere.

This will be consistent with --camera-id (there will be many camera
options, so an option --camera would be confusing).

PR #4213 <https://github.com/Genymobile/scrcpy/pull/4213>

app/data/bash-completion/scrcpy

@@ -13,7 +13,7 @@ _scrcpy() {
         --crop=
         -d --select-usb
         --disable-screensaver
-        --display=
+        --display-id=
         --display-buffer=
         -e --select-tcpip
         -f --fullscreen
@@ -140,7 +140,7 @@ _scrcpy() {
         |--audio-encoder \
         |--audio-output-buffer \
         |--crop \
-        |--display \
+        |--display-id \
         |--display-buffer \
         |--max-fps \
         |-m|--max-size \