fix(cpp): incorrect indent of class with opening { on new line (#5811)

queries/cpp/indents.scm

@@ -1,11 +1,9 @@
 ; inherits: c
 
 [
-  (class_specifier)
   (condition_clause)
 ] @indent.begin
 
 ((field_initializer_list) @indent.begin
   (#set! indent.start_at_same_line 1))
 (access_specifier) @indent.branch
-

tests/indent/cpp/class_newline.cpp

@@ -0,0 +1,9 @@
+class Foo
+{
+    int x;
+    class Bar
+    {
+        int y;
+    };
+    Bar z;
+};