Fix panic on "show ospfv2 neighbor 3.3.3.3"

[sha90w]

One symbol fix to prevent panic when running "show ospfv2 neighbor x.x.x.x"

clab-bgp-rt4# show ospfv2 neighbor 3.3.3.3

thread 'main' (2739917) panicked at src/internal_commands.rs:170:46:
called `Result::unwrap()` on an `Err` value: Error { errcode: 7, msg: Some("Unexpected XPath token \"Operator(Equal)\" (\"='3.3.3.3']\")."), path: None, apptag: None }
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

[rwestphal]

Thanks for fixing this! Merging...