UI: Show "OBS Studio" in linux desktop link

Closes obsproject/obs-studio#1563

UI/dist/obs.desktop

@@ -1,6 +1,6 @@
 [Desktop Entry]
 Version=1.0
-Name=OBS
+Name=OBS Studio
 GenericName=Streaming/Recording Software
 GenericName[fr]=Logiciel d'enregistrement/diffusion
 Comment=Free and Open Source Streaming/Recording Software