allow shared (not just shared-) as prefix for shared jitsis

this might make things less confusing for some people

lib/Properties.hs

@@ -345,7 +345,7 @@ checkTileLayerProperty p@(Property name _value) = case name of
         suggestProperty $ Property "jitsiTrigger" "onaction"
 
         -- prepend jitsi room names to avoid name clashes
-        unless ("shared-" `isPrefixOf` jitsiRoom) $ do
+        unless ("shared" `isPrefixOf` jitsiRoom) $ do
           assemblyname <- lintConfig configAssemblyTag
           setProperty "jitsiRoom" (assemblyname <> "-" <> jitsiRoom)
     "jitsiTrigger" -> do