[clang] [clang][NFC] Reduce one of JSON dump tests (PR #195026)

[Vlad Serebrennikov via cfe-commits]

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@@ -124,19 +145,66 @@ void func() {
 // DUMP-NEXT: `-TemplateArgument type 'Key'
 // DUMP-NEXT:   `-TemplateTypeParmType {{.*}} 'Key' dependent depth 0 index 0
 // DUMP-NEXT:     `-TemplateTypeParm {{.*}} 'Key'
+
+// FIXME: JSON dump is missing TemplateTypeParm node at the end.
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Endilll wrote:

An AST node is missing in the JSON dump

https://github.com/llvm/llvm-project/pull/195026