Remove unnecessary context from some util functions.

src/parser/planning.rs

@@ -21,7 +21,7 @@ pub fn planning<'r, 's>(
     context: Context<'r, 's>,
     input: OrgSource<'s>,
 ) -> Res<OrgSource<'s>, Planning<'s>> {
-    start_of_line(context, input)?;
+    start_of_line(input)?;
     let (remaining, _leading_whitespace) = space0(input)?;
     let (remaining, _planning_parameters) = separated_list1(space1, planning_parameter)(remaining)?;
     let (remaining, _trailing_ws) = tuple((space0, alt((line_ending, eof))))(remaining)?;