intel/fs: Simplify persample_dispatch

Thanks to the previous commit, we no longer need this check.

Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14020>

src/intel/compiler/brw_fs.cpp

@@ -7247,8 +7247,7 @@ brw_nir_populate_wm_prog_data(const nir_shader *shader,
    prog_data->persample_dispatch =
       key->multisample_fbo &&
       (key->persample_interp ||
-       shader->info.fs.uses_sample_shading ||
-       shader->info.outputs_read);
+       shader->info.fs.uses_sample_shading);
 
    if (devinfo->ver >= 6) {
       prog_data->uses_sample_mask =