Fix weather flicker 4803 (multitheftauto#4870)

#### Summary

Re-apply MTA's blended weather state in `PreWorldProcessHandler` so it
runs after the engine's `CWeather::Update` but before
`CTimeCycle::CalcColoursForPoint` reads the weather globals for
rendering.

#### Motivation

Fixes multitheftauto#4803. When `setWeatherBlended`/`setTime` are used (e.g. race
resource restart/respawn), the sky and ambient lighting flicker for 1-2
frames in fullscreen.

The engine's `CWeather::Update` (at `0x53BFC2` in `CGame::Process`)
detects a clock wrap when `setTime` jumps the game clock past its
internal `InterpolationValue`. It then overwrites
`OldWeatherType`/`NewWeatherType` with its own weather-list pick.
`CalcColoursForPoint` (at `0x53C0DA`) reads these wrong values and
computes incorrect sky/ambient colors for that frame. MTA's
`CBlendedWeather::DoPulse` previously only ran in `DoPulses` during
`Render2dStuff`, which is after the frame was already rendered with the
wrong state.

Fullscreen-only because exclusive mode bypasses DWM composition, so
every frame including the glitch frames is presented directly. Windowed
mode's DWM triple buffering absorbs them.

#### Test plan

1. Join a server running the default race resource
2. Set fullscreen (any mode)
3. Use `setWeatherBlended` + `setTime` via script, then restart the race
resource to respawn
4. Observe no sky/lighting flicker on respawn

#### Checklist

* [x] Your code should follow the [coding
guidelines](https://wiki.multitheftauto.com/index.php?title=Coding_guidelines).
* [x] Smaller pull requests are easier to review. If your pull request
is beefy, your pull request should be reviewable commit-by-commit.

Author: Zephkek

Client/mods/deathmatch/logic/CClientGame.cpp

@@ -3902,6 +3902,14 @@ void CClientGame::PreRenderSkyHandler()
 
 void CClientGame::PreWorldProcessHandler()
 {
+    // Fix #4803: Re-apply MTA's weather state before CTimeCycle::CalcColoursForPoint()
+    // reads the weather globals for rendering. The engine's CWeather::Update() (0x53BFC2)
+    // runs earlier in CGame::Process() and can overwrite OldWeatherType/NewWeatherType
+    // when setTime() causes a clock wrap. This hook (at CWorld::Process, 0x53C095) runs
+    // after that overwrite but before CalcColoursForPoint (0x53C0DA) consumes the values,
+    // ensuring the rendered frame always uses MTA's intended weather.
+    if (m_pManager->IsGameLoaded() && m_pBlendedWeather)
+        m_pBlendedWeather->DoPulse();
 }
 
 void CClientGame::PostWorldProcessHandler()