panfrost: Avoid a XFB special case

This worked around an issue that doesn't apply to the Valhall XFB lowering.

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19238>

src/panfrost/lib/pan_shader.c

@@ -139,8 +139,7 @@ collect_varyings(nir_shader *s, nir_variable_mode varying_mode,
                  */
                 if (type == nir_type_float &&
                     (var->data.precision == GLSL_PRECISION_MEDIUM ||
-                     var->data.precision == GLSL_PRECISION_LOW) &&
-                    !s->info.has_transform_feedback_varyings) {
+                     var->data.precision == GLSL_PRECISION_LOW)) {
                         type |= 16;
                 } else {
                         type |= 32;