GResource: Correct path for stylesheets

com.cassidyjames.butler.json

@@ -0,0 +1,30 @@
+{
+  "app-id": "com.cassidyjames.butler",
+  "runtime": "org.gnome.Platform",
+  "runtime-version": "46",
+  "sdk": "org.gnome.Sdk",
+  "command": "com.cassidyjames.butler",
+  "finish-args": [
+    "--socket=wayland",
+    "--socket=fallback-x11",
+    "--share=ipc",
+    "--share=network",
+    "--device=dri"
+  ],
+  "modules": [
+    {
+      "name": "butler",
+      "buildsystem": "meson",
+      "run-tests": true,
+      "config-opts": [
+        "-Dprofile=release"
+      ],
+      "sources": [
+        {
+          "type": "dir",
+          "path": "."
+        }
+      ]
+    }
+  ]
+}

data/gresource.xml

@@ -2,6 +2,8 @@
 <gresources>
   <gresource prefix="/com/cassidyjames/butler/">
     <file preprocess="xml-stripblanks" compressed="true">metainfo.xml.in</file>
+    <file>style.css</file>
+    <file>style-dark.css</file>
     <file alias="Devel/style.css">style.css</file>
     <file alias="Devel/style-dark.css">style-dark.css</file>
   </gresource>