fix: add missing parameter types to function declarations

Some functions were declared without parameters in header files,
despite their implementations specifying arguments. This mismatch
is deprecated in all versions of C and is disallowed in C23.

This change updates the declarations to match their definitions,
ensuring compatibility with C standards, avoiding potential
undefined behavior, and improving support in tools and editors.

src/tools/bookmark_ignore.h

@@ -12,7 +12,7 @@
 
 #include "xmpp/xmpp.h"
 
-void bookmark_ignore_on_connect();
+void bookmark_ignore_on_connect(const char* const barejid);
 void bookmark_ignore_on_disconnect();
 gboolean bookmark_ignored(Bookmark* bookmark);
 gchar** bookmark_ignore_list(gsize* len);