build: share desktop file between flatpak and snap

Fix zoeyfyi#192

I'm hoping I didn't just break the snap

build.rs

@@ -18,7 +18,7 @@ fn add_files(xml: &mut String, folder: &str) {
             continue;
         }
 
-        if path.file_type().unwrap().is_file() {
+        if path.path().is_file() {
             xml.push_str(&format!(
                 "\t\t<file>{}</file>\n",
                 path.path()
@@ -27,7 +27,7 @@ fn add_files(xml: &mut String, folder: &str) {
                     .replace("\\", "/")
                     .trim_start_matches("resources/")
             ));
-        } else if path.file_type().unwrap().is_dir() {
+        } else if path.path().is_dir() {
             add_files(xml, &path.path().display().to_string());
         } else {
             panic!("expected file or folder");

flatpak/fyi.zoey.Boop-GTK.json

@@ -39,11 +39,11 @@
                 "ls -al target/release/gn_out/obj",
                 "cargo --offline build --release",
                 "install -Dm755 ./target/release/boop-gtk -t /app/bin/",
-                "install -Dm644 ./flatpak/data/${FLATPAK_ID}.metainfo.xml -t /app/share/metainfo/",
-                "install -Dm644 ./flatpak/data/${FLATPAK_ID}.desktop -t /app/share/applications/",
-                "install -Dm644 ./flatpak/data/${FLATPAK_ID}.svg -t /app/share/icons/hicolor/scalable/apps/",
-                "install -Dm644 ./flatpak/data/${FLATPAK_ID}.png -t /app/share/icons/hicolor/256x256/apps/",
-                "install -Dm644 ./flatpak/data/${FLATPAK_ID}-symbolic.svg -t /app/share/icons/hicolor/symbolic/apps/"
+                "install -Dm644 ./data/${FLATPAK_ID}.metainfo.xml -t /app/share/metainfo/",
+                "install -Dm644 ./data/${FLATPAK_ID}.desktop -t /app/share/applications/",
+                "install -Dm644 ./data/${FLATPAK_ID}.svg -t /app/share/icons/hicolor/scalable/apps/",
+                "install -Dm644 ./data/${FLATPAK_ID}.png -t /app/share/icons/hicolor/256x256/apps/",
+                "install -Dm644 ./data/${FLATPAK_ID}-symbolic.svg -t /app/share/icons/hicolor/symbolic/apps/"
             ],
             "sources": [
                 {