Correct reimplementation of order traits

Following the clippy rule 'incorrect_partial_ord_impl_on_ord_type'.
Previous fix proposed by clippy was incorrect.

Author: jpraynaud

mithril-common/src/database/version_checker.rs

@@ -154,13 +154,13 @@ impl SqlMigration {
 
 impl PartialOrd for SqlMigration {
     fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
-        Some(self.version.cmp(&other.version))
+        Some(self.cmp(other))
     }
 }
 
 impl Ord for SqlMigration {
     fn cmp(&self, other: &Self) -> Ordering {
-        self.partial_cmp(other).unwrap()
+        self.version.cmp(&other.version)
     }
 }
 

mithril-common/src/entities/signer.rs

@@ -152,7 +152,7 @@ impl PartialEq for SignerWithStake {
 
 impl PartialOrd for SignerWithStake {
     fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
-        Some(self.party_id.cmp(&other.party_id))
+        Some(self.cmp(other))
     }
 }