Switch inline babel call to using bracket depth from OrgSource instead of from the context.

This is for the same reasons as footnote references.

src/parser/parser_context.rs

@@ -124,19 +124,6 @@ pub enum ContextElement<'r, 's> {
     /// radio links matching the contents of radio targets.
     RadioTarget(Vec<&'r Vec<Object<'s>>>),
 
-    /// Stores the current bracket or parenthesis depth inside an inline babel call.
-    ///
-    /// Inside an inline babel call the headers must have balanced
-    /// parentheses () and the arguments must have balanced brackets
-    /// [], so this stores the amount of opening brackets subtracted
-    /// by the amount of closing brackets within the definition must
-    /// equal zero.
-    ///
-    /// A reference to the position in the string is also included so
-    /// unbalanced brackets can be detected in the middle of an
-    /// object.
-    BabelHeaderBracket(BabelHeaderBracket<'s>),
-
     /// Stores the current bracket or parenthesis depth inside an inline babel call.
     ///
     /// Inside an inline babel call the headers must have balanced
@@ -156,12 +143,6 @@ pub struct ExitMatcherNode<'r> {
     pub class: ExitClass,
 }
 
-#[derive(Debug)]
-pub struct BabelHeaderBracket<'s> {
-    pub position: OrgSource<'s>,
-    pub depth: usize,
-}
-
 #[derive(Debug)]
 pub struct InlineSourceBlockBracket<'s> {
     pub position: OrgSource<'s>,