Fix :hide-header: behavior with full nesting

The usage was removed when :hide-header: was used with full nesting before. This should make it behave the same as it does with short nesting.

Author: TomerGodinger

sphinx_click/ext.py

@@ -483,9 +483,9 @@ def _format_summary(
         for line in _format_header(ctx):
             yield line
 
-        # usage
-        for line in _format_usage(ctx):
-            yield line
+    # usage
+    for line in _format_usage(ctx):
+        yield line
 
     for line in _format_subcommand_summary(ctx, commands):
         yield line