remove duplicate details

src/repository/mod.rs

@@ -27,7 +27,7 @@ impl fmt::Display for Error {
     }
 }
 
-#[derive(Clone)]
+#[derive(Clone, PartialEq)]
 pub struct TagDetails {
     pub arch: Option<String>,
     pub os: Option<String>,

src/widget/details.rs

@@ -18,6 +18,7 @@ impl Details {
         };
 
         detail.details.sort_by(|a, b| a.arch.cmp(&b.arch));
+        detail.details.dedup();
         detail
     }