[lightsoff/gnome-3-30] snap: fix typo

[Jeremy Bicha <jbicha src gnome org>]

commit aba6432a46b33838266d54401e6136916eb0af75
Author: Jeremy Bicha <jbicha ubuntu com>
Date:   Thu Jan 31 20:40:12 2019 -0500

    snap: fix typo

 snap/snapcraft.yaml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/snap/snapcraft.yaml b/snap/snapcraft.yaml
index 4539b8d..36e2aad 100644
--- a/snap/snapcraft.yaml
+++ b/snap/snapcraft.yaml
@@ -76,7 +76,7 @@ parts:
 
   lightsoff:
     after: [desktop-gnome-platform]
-    source: ,
+    source: .
     source-type: git
     override-build: |
       sed -i.bak -e 's|Icon=lightsoff$|Icon=${SNAP}/meta/gui/lightsoff.svg|g' data/lightsoff.desktop.in