Correcting the Typo in entrypoint2 (#3339)

There’s a small typo in `entrypoint2`: replace
`Ok(self.view1.get(&key).await?)` with `Ok(self.view2.get(&key).await?)`
because `view2` is the MapView that requires a key.

Signed-off-by: bigbear <155267841+aso20455@users.noreply.github.com>

linera-indexer/plugins/src/template.rs

@@ -37,7 +37,7 @@ impl Template<C> {
     }
 
     pub async fn entrypoint2(&self, key: u32) -> Result<String, IndexerError> {
-        Ok(self.view1.get(&key).await?)
+        Ok(self.view2.get(&key).await?)
     }
 
     // Other functions are derived to fill the `linera_indexer::plugin::Plugin` trait.