id_str: macro: refer to IdStr with full path

... otherwise callers need to explicitly `use gst::IdStr`.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/merge_requests/1778>

gstreamer/src/id_str/mod.rs

@@ -44,7 +44,7 @@ mod serde;
 #[macro_export]
 macro_rules! idstr {
     ($s:literal) => {
-        IdStr::from_static($crate::glib::gstr!($s))
+        $crate::IdStr::from_static($crate::glib::gstr!($s))
     };
 }
 

gstreamer/src/id_str/serde.rs

@@ -22,7 +22,6 @@ impl<'de> Deserialize<'de> for IdStr {
 
 #[cfg(test)]
 mod tests {
-    use super::*;
     use crate::idstr;
 
     #[test]