Fix #118: use File.equals

app/src/main/java/com/zeapo/pwdstore/utils/PasswordItem.java

@@ -90,8 +90,7 @@ public class PasswordItem implements Comparable{
     public boolean equals(Object o){
         PasswordItem other = (PasswordItem) o;
         // Makes it possible to have a category and a password with the same name
-        return (other.getType() + other.getName())
-                .equals(this.getType() + this.getName());
+        return (other.getFile().equals(this.getFile()));
 }
 
     @Override