[Bugfix] Fix disappearing grenade

The way to reproduce:
1) Attach grenade launcher to the weapon
2) Switch to GL mode and reload GL
3) Switch back to bullets
4) Detach GL. GL would be spawned to the inventory, but loaded grenade would stay in the weapon.
It happens because weapon has 2 magazines: for current active ammo and for secondary (inactive) ammo. So, you should force game to unload ammos from "GL's" mag.

src/xrGame/WeaponMagazinedWGrenade.cpp

@@ -512,11 +512,12 @@ bool CWeaponMagazinedWGrenade::Detach(LPCSTR item_section_name, bool b_spawn_ite
         !xr_strcmp(*m_sGrenadeLauncherName, item_section_name))
     {
         m_flagsAddOnState &= ~CSE_ALifeItemWeapon::eWeaponAddonGrenadeLauncher;
-        if (m_bGrenadeMode)
-        {
-            UnloadMagazine();
-            PerformSwitchGL();
-        }
+
+		// Now we need to unload GL's magazine
+		if (!m_bGrenadeMode)
+			PerformSwitchGL();
+		UnloadMagazine();
+		PerformSwitchGL();        
 
         UpdateAddonsVisibility();