Use reverse TLD filenames for installed Linux files where appropriate

dist/azahar-room.desktop

@@ -3,7 +3,7 @@ Version=1.0
 Type=Application
 Name=Azahar Room
 Comment=Multiplayer room host for Azahar
-Icon=azahar
+Icon=org.azahar_emu.Azahar
 TryExec=azahar-room
 Exec=azahar-room %f
 Categories=Game;Emulator;

dist/azahar.desktop

@@ -6,7 +6,7 @@ GenericName=3DS Emulator
 GenericName[fr]=Émulateur 3DS
 Comment=Nintendo 3DS video game console emulator
 Comment[fr]=Émulateur de console de jeu Nintendo 3DS
-Icon=azahar
+Icon=org.azahar_emu.Azahar
 TryExec=azahar
 Exec=azahar %f
 Categories=Game;Emulator;