Update video_mencoder.lua

fix linebrakes

Author: supertobi

contrib/video_mencoder.lua

@@ -51,9 +51,9 @@ end
 
 local function create_video_mencoder(storage, image_table, extra_data)
     dt.print("video_mencoder is deprecated.  Please use video_ffmpeg instead.  Please see the log for more details.")
-    dt.print_log("The mencoder executable is no longer distributed as part of most distributions,\n
-     therefore video_mencoder is deprecated. video_ffmpeg should be used in it's place.  video_mencoder\n
-     will be removed when darktable 2.8 is released.")
+    dt.print_log("The mencoder executable is no longer distributed as part of most distributions,")
+    dt.print_log("therefore video_mencoder is deprecated. video_ffmpeg should be used in it's place.  video_mencoder")
+    dt.print_log("will be removed when darktable 2.8 is released.")
     if not df.check_if_bin_exists("mencoder") then
         dt.print_error(_("mencoder not found"))
         return