uv/tests: update resolution-markers in conflict test

This change is correct because disjointness checks now
incorporate conflicts. In this case, there are actually
four forks. Two of them correspond to
`sys_platform == 'darwin'` and `sys_platform != 'darwin'`,
but neither of those contain `jinja2==3.1.3`. Instead,
they contain other versions of `jinja2` linked to other
extras.

If we ever add conflicts to our `resolution-markers` in
the lock file, then those forks should show up here
again. (Because, of course, some forks do contain
`jinja2==3.1.3` here.)

crates/uv/tests/it/lock.rs

@@ -19421,8 +19421,6 @@ fn lock_multiple_sources_index_disjoint_extras_with_marker() -> Result<()> {
         version = "3.1.3"
         source = { registry = "https://download.pytorch.org/whl/cu124" }
         resolution-markers = [
-            "sys_platform == 'darwin'",
-            "sys_platform != 'darwin'",
         ]
         dependencies = [
             { name = "markupsafe" },