[libgee] Add more missing generic type arguments

[Rico Tzschichholz <ricotz src gnome org>]

commit ebf769162200ac7a4ad070261c3232ac7dc9f7a2
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Sun Jan 30 19:12:33 2022 +0100

    Add more missing generic type arguments

 gee/concurrentset.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gee/concurrentset.vala b/gee/concurrentset.vala
index fe1741a..131d73e 100644
--- a/gee/concurrentset.vala
+++ b/gee/concurrentset.vala
@@ -1279,7 +1279,7 @@ public class Gee.ConcurrentSet<G> : AbstractSortedSet<G> {
                        return removed;
                }
 
-               private static inline bool remove_level (CompareDataFunc<G>? cmp, ref Tower<G> prev, Tower<G> 
curr, uint8 level) {
+               private static inline bool remove_level<G> (CompareDataFunc<G>? cmp, ref Tower<G> prev, 
Tower<G> curr, uint8 level) {
                        bool status;
                        bool flagged = curr.try_flag (cmp, ref prev, out status, level);
                        if (status) {