Added function to set tray size according to OS, fixed toggle tray
Added function to set tray size according to OS, fixed toggle tray

brainwane/zulip-electron,zulip/zulip-electron,zulip/zulip-electron,zulip/zulip-desktop,brainwane/zulip-electron,zulip/zulip-desktop,zulip/zulip-desktop,zulip/zulip-desktop,brainwane/zulip-electron,zulip/zulip-electron