model: Add platform information to the About Pop-Up.

Shows PLATFORM from platform_code.py on the About Pop-Up.

Author: plugyawn

zulipterminal/ui_tools/views.py

@@ -38,6 +38,7 @@
     match_stream,
     match_user,
 )
+from zulipterminal.platform_code import PLATFORM
 from zulipterminal.server_url import near_message_url
 from zulipterminal.ui_tools.boxes import MessageBox, PanelSearchBox
 from zulipterminal.ui_tools.buttons import (
@@ -1125,6 +1126,7 @@ def __init__(
                     ("Notifications", "enabled" if notify_enabled else "disabled"),
                 ],
             ),
+            ("Platform", [("Detected Platform", PLATFORM if PLATFORM else "Invalid Platform")])
         ]
 
         popup_width, column_widths = self.calculate_table_widths(contents, len(title))