Unify packaged/non-packaged binary name

lib/xdg/org.telegram.desktop.desktop

@@ -1,8 +1,8 @@
 [Desktop Entry]
 Name=Telegram
 Comment=New era of messaging
-TryExec=telegram-desktop
-Exec=telegram-desktop -- %u
+TryExec=Telegram
+Exec=Telegram -- %u
 Icon=org.telegram.desktop
 Terminal=false
 StartupWMClass=TelegramDesktop
@@ -17,6 +17,6 @@ X-GNOME-UsesNotifications=true
 X-GNOME-SingleWindow=true
 
 [Desktop Action quit]
-Exec=telegram-desktop -quit
+Exec=Telegram -quit
 Name=Quit Telegram
 Icon=application-exit

lib/xdg/org.telegram.desktop.metainfo.xml

@@ -106,7 +106,7 @@
     </content_rating>
     <launchable type="desktop-id">org.telegram.desktop.desktop</launchable>
     <provides>
-        <binary>telegram-desktop</binary>
+        <binary>Telegram</binary>
         <dbus type="session">org.telegram.desktop</dbus>
         <mediatype>x-scheme-handler/tg</mediatype>
         <mediatype>x-scheme-handler/tonsite</mediatype>

lib/xdg/org.telegram.desktop.service

@@ -1,3 +1,3 @@
 [D-BUS Service]
 Name=org.telegram.desktop
-Exec=@CMAKE_INSTALL_FULL_BINDIR@/telegram-desktop
+Exec=@CMAKE_INSTALL_FULL_BINDIR@/Telegram