Fix install of desktop file in flatpak

CMakeLists.txt

@@ -747,9 +747,10 @@ if(UNIX AND NOT APPLE)
 	install (FILES "resources/nheko-256.png" DESTINATION "${CMAKE_INSTALL_DATAROOTDIR}/icons/hicolor/256x256/apps" RENAME "${APPID}.png")
 	install (FILES "resources/nheko-512.png" DESTINATION "${CMAKE_INSTALL_DATAROOTDIR}/icons/hicolor/512x512/apps" RENAME "${APPID}.png")
 	install (FILES "resources/nheko.svg" DESTINATION "${CMAKE_INSTALL_DATAROOTDIR}/icons/hicolor/scalable/apps" RENAME "${APPID}.svg")
-	install (FILES "resources/nheko.desktop" DESTINATION "${CMAKE_INSTALL_DATAROOTDIR}/applications" RENAME "${APPID}.desktop")
 	install (FILES "resources/_nheko" DESTINATION "${CMAKE_INSTALL_DATAROOTDIR}/zsh/site-functions")
 
+	configure_file("resources/nheko.desktop.in" "resources/nheko.desktop" @ONLY)
+	install (FILES "resources/nheko.desktop" DESTINATION "${CMAKE_INSTALL_DATAROOTDIR}/applications" RENAME "${APPID}.desktop")
 	configure_file("resources/nheko.appdata.xml.in" "resources/nheko.appdata.xml" @ONLY)
 	install (FILES "resources/nheko.appdata.xml" DESTINATION "${CMAKE_INSTALL_DATAROOTDIR}/metainfo" RENAME "${APPID}.appdata.xml")
 

resources/nheko.desktop.in

@@ -2,11 +2,11 @@
 Name=nheko
 Version=1.0
 Comment=Desktop client for Matrix
-Exec=nheko %u
-Icon=nheko
+Exec=@APPID@ %u
+Icon=@APPID@
 Type=Application
 Categories=Network;InstantMessaging;Qt;
-StartupWMClass=nheko
+StartupWMClass=@APPID@
 Terminal=false
 MimeType=x-scheme-handler/matrix;
 X-GNOME-UsesNotifications=true