remove template id from constructor/destructor

[toge]

In 0.10.1, I met compilation errors on gcc 13:

In file included from kaitai/kaitaistream.cpp:2:
kaitai/exceptions.h:118:35: error: expected unqualified-id before ‘const’
  118 |     validation_not_equal_error<T>(const T& expected, const T& actual, kstream* io, const std::string src_path):
      |                                   ^~~~~
kaitai/exceptions.h:118:35: error: expected ‘)’ before ‘const’
  118 |     validation_not_equal_error<T>(const T& expected, const T& actual, kstream* io, const std::string src_path):
      |                                  ~^~~~~
      |                                   )
kaitai/exceptions.h:127:13: error: template-id not allowed for destructor
  127 |     virtual ~validation_not_equal_error<T>() KS_NOEXCEPT {};
      |             ^
...

They are caused by <T> in constructor/destructor.
I want to remove it.

I confirmed gcc/clang/MSVC work fine after deleteing <T>.

[generalmimon]

Reproduced on gcc 11.4, gcc 12.3 and gcc 13.2, but only with the -std=c++20 flag. Not reproduced on gcc 10.5 or clang 17.0.1.

[generalmimon]

@toge Thanks!