fixed dark_chan color and selector

data/themes.json

@@ -17,7 +17,7 @@
         {
             "name": "Dark Chan",
             "id": "dark_chan",
-            "sha256": "2eb2b4b252fab617f3adcfea1d7c910d20202dc2785d28f114b1fe65cbfeebeb",
+            "sha256": "8159a17c868631a4bde5368087675994cdbdf7b3949819693b77118f034deb74",
             "size": "~62.2 MB",
             "previewImageUrl": "https://themes.stackwallet.com/previews/darkchans-theme.png"
         },
@@ -64,4 +64,4 @@
             "previewImageUrl": "https://themes.stackwallet.com/previews/orange-theme.png"
         }
     ]
-}
+}