Debugger: fix manual list template arguments

'res' is not part of the function anymore, the result of the split is
directly written into self.type_template_arguments_cache since
67072d3f5b

Change-Id: Ib76b1f82a4f807e54fbb3cec96b317c36011bf51
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

share/qtcreator/debugger/dumper.py

@@ -717,7 +717,7 @@ class DumperBase():
                 c = ord(item[0])
                 if c in (45, 46) or (c >= 48 and c < 58):  # '-', '.' or digit.
                     if '.' in item:
-                        res.append(float(item))
+                        self.type_template_arguments_cache[(typeid, idx)] = float(item)
                     else:
                         if item.endswith('l'):
                             item = item[:-1]