rust-index: stop calling `with_offset` in the tests

rust-index: stop calling `with_offset` in the tests

We are not adding any data, so why are we setting any offset?

--- a/rust/hg-core/src/revlog/mod.rs	Fri Feb 23 15:57:50 2024 +0100
+++ b/rust/hg-core/src/revlog/mod.rs	Mon Feb 26 13:41:02 2024 +0100
@@ -859,7 +859,7 @@
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::index::{IndexEntryBuilder, INDEX_ENTRY_SIZE};
+    use crate::index::IndexEntryBuilder;
     use itertools::Itertools;
 
     #[test]
@@ -897,15 +897,10 @@
             .is_first(true)
             .with_version(1)
             .with_inline(true)
-            .with_offset(INDEX_ENTRY_SIZE)
             .with_node(node0)
             .build();
-        let entry1_bytes = IndexEntryBuilder::new()
-            .with_offset(INDEX_ENTRY_SIZE)
-            .with_node(node1)
-            .build();
+        let entry1_bytes = IndexEntryBuilder::new().with_node(node1).build();
         let entry2_bytes = IndexEntryBuilder::new()
-            .with_offset(INDEX_ENTRY_SIZE)
             .with_p1(Revision(0))
             .with_p2(Revision(1))
             .with_node(node2)
@@ -971,13 +966,9 @@
             .is_first(true)
             .with_version(1)
             .with_inline(true)
-            .with_offset(INDEX_ENTRY_SIZE)
             .with_node(node0)
             .build();
-        let entry1_bytes = IndexEntryBuilder::new()
-            .with_offset(INDEX_ENTRY_SIZE)
-            .with_node(node1)
-            .build();
+        let entry1_bytes = IndexEntryBuilder::new().with_node(node1).build();
         let contents = vec![entry0_bytes, entry1_bytes]
             .into_iter()
             .flatten()