KCL: stdlib macro should now assume all functions use keywords (#7158)

This has been enforced by the parser since #6639, so there's no need for `keywords = true` in every stdlib function anymore.

rust/kcl-lib/src/std/csg.rs

@@ -106,7 +106,6 @@ pub async fn union(exec_state: &mut ExecState, args: Args) -> Result<KclValue, K
 #[stdlib {
     name = "union",
     feature_tree_operation = true,
-    keywords = true,
     unlabeled_first = true,
     args = {
         solids = {docs = "The solids to union."},
@@ -232,7 +231,6 @@ pub async fn intersect(exec_state: &mut ExecState, args: Args) -> Result<KclValu
 #[stdlib {
     name = "intersect",
     feature_tree_operation = true,
-    keywords = true,
     unlabeled_first = true,
     args = {
         solids = {docs = "The solids to intersect."},
@@ -352,7 +350,6 @@ pub async fn subtract(exec_state: &mut ExecState, args: Args) -> Result<KclValue
 #[stdlib {
     name = "subtract",
     feature_tree_operation = true,
-    keywords = true,
     unlabeled_first = true,
     args = {
         solids = {docs = "The solids to use as the base to subtract from."},