awful.mouse.finder: Remove rounded_corners call

Let's just quote a mail I received from Rastislav Barlik:

I tried to make use of awful.mouse.finder but I found out that it's not working
as supporting functions rounded_corners were removed with commit
03e0ee53d2.

Signed-off-by: Uli Schlachter <psychon@znc.in>

lib/awful/mouse/finder.lua.in

@@ -67,7 +67,8 @@ local function animate(self)
     data[self].wibox:geometry({width = r + data[self].factor,
         height = r + data[self].factor })
     -- need -1 to the radius to draw a full circle
-    a_wibox.rounded_corners(data[self].wibox, (r + data[self].factor)/2 -1)
+    -- FIXME: The rounded_corners() API was removed
+    -- a_wibox.rounded_corners(data[self].wibox, (r + data[self].factor)/2 -1)
     -- make sure the mouse finder follows the pointer. Uh!
     place(self)
 end
@@ -80,7 +81,8 @@ local function show(self)
     if data[self].wibox.visible then return end
     if not data[self].timer.started then
         data[self].wibox:geometry({width = data[self].radius, height = data[self].radius })
-        a_wibox.rounded_corners(data[self].wibox, data[self].radius/2 -1)
+        -- FIXME: The rounded_corners() API was removed
+        -- a_wibox.rounded_corners(data[self].wibox, data[self].radius/2 -1)
         data[self].timer:start()
         data[self].animate_timer:start()
     end