[lldb][Test] TestVSCode_completions.py: fix expected type strings

Fixes build failures following https://reviews.llvm.org/D141828

Author: Michael137

lldb/test/API/tools/lldb-vscode/completions/TestVSCode_completions.py

@@ -41,7 +41,7 @@ def test_completions(self):
             [
                 {
                     "text": "var",
-                    "label": "var -- vector<basic_string<char, char_traits<char>, allocator<char>>, allocator<basic_string<char, char_traits<char>, allocator<char>>>> &",
+                    "label": "var -- vector<basic_string<char> > &",
                 }
             ],
             [{"text": "var1", "label": "var1 -- int &"}],
@@ -66,7 +66,7 @@ def test_completions(self):
             [
                 {
                     "text": "var",
-                    "label": "var -- vector<basic_string<char, char_traits<char>, allocator<char> >, allocator<basic_string<char, char_traits<char>, allocator<char> > > > &",
+                    "label": "var -- vector<basic_string<char> > &",
                 }
             ],
         )