starknet_os: fix tab count bug (#10439)

Author: AvivYossef-starkware

crates/starknet_os/src/hint_processor/os_logger.rs

@@ -480,6 +480,8 @@ impl OsLogger {
         )?);
         self.current_tx = Some(OsTransactionTrace::new(tx_type, tx_hash));
         log::info!("Entering transaction: {tx_hash} (type: {tx_type:?})");
+        // Increment tab_count to match the decrement in exit_tx's log call.
+        self.tab_count += 1;
         Ok(())
     }