fix m_BeforeUpdateTime produces garbage on first loop

[NOOBDY]

the original implementation calls SDL_ functions before SDL_init is called, which probably produces garbage results on first loop on some environments (Linux?)

and on

practical-tools-for-simple-design/src/Core/Context.cpp

Lines 131 to 135 in 2866935

	ms_t afterUpdate = Util::Time::GetElapsedTimeMs();
	ms_t updateTime = afterUpdate - m_BeforeUpdateTime;
	if (updateTime < frameTime) {
	SDL_Delay(static_cast<Uint32>(frameTime - updateTime));
	}

updateTime can be a large negative number, causing SDL_Delay to sleep for a very long time

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"

[Dragonfly911117]

LGTM