awful.client: Emit correct signal

When awful.client.property.set() was called it always emitted property::floating
on the client. Instead it should emit propert::<name of the property> of course!

Signed-off-by: Uli Schlachter <psychon@znc.in>
Signed-off-by: Julien Danjou <julien@danjou.info>

lib/awful/client.lua.in

@@ -825,7 +825,7 @@ function property.set(c, prop, value)
         data.properties[c] = {}
     end
     data.properties[c][prop] = value
-    c:emit_signal("property::floating")
+    c:emit_signal("property::" .. prop)
 end
 
 -- Register standards signals