Fix: successful execution of 'reth stage --commit' did not write results to the database (#4027)

bin/reth/src/stage/run.rs

@@ -265,6 +265,10 @@ impl Command {
             }
         }
 
+        if self.commit {
+            provider_rw.commit()?;
+        }
+
         Ok(())
     }
 }