Fix the bug where warhead flags are read twice

[DeathFishAtEase]

Does anyone know why repeated loading is necessary? I discovered this while handling #2093 and suspect it is a bug.
By switching to the develop branch and adding log in WarheadTypeExt::ExtData::LoadFromINIFile, it can be observed that each warhead is loaded twice.
For example, based on 6035b7b, make the following modifications:

void WarheadTypeExt::ExtData::LoadFromINIFile(CCINIClass* const pINI)
{
	auto pThis = this->OwnerObject();
	const char* pSection = pThis->ID;
+	static std::map<uintptr_t, int> iniCallCount;
+	uintptr_t iniAddr = reinterpret_cast<uintptr_t>(pINI);
+	int count = ++iniCallCount[iniAddr];
+	Debug::Log("[DEBUG] LoadFromINIFile for [%s] count: %d\n", pSection, count);
	INI_EX exINI(pINI);

In debug.log, it can be observed:

[github-actions]

Nightly build for this pull request:

• compiled-dll-f804c5133bdedb85312af1c40b32ff7e261c9e1c.zip
  These artifacts will expire in 90 days and will not be available for download after that time.

This comment is automatic and is meant to allow guests to get latest nightly builds for this pull request without registering. It is updated on every successful build.

[TaranDahl]

What exactly causes it to be read twice?