[Bugfix] Incorrect zoom after attaching 'custom' scope to the weapon

When you attaches 'custom' scope to the weapon which has just been spawned, you could find that initial zoom of the scope is completely incorrect.
The problem is that m_fRTZoomFactor field, which defines real currently used zoom, hasn't been updated after attaching scope.

src/xrGame/WeaponMagazined.cpp

@@ -969,6 +969,7 @@ void CWeaponMagazined::InitAddons()
                 READ_IF_EXISTS(pSettings, r_bool, GetScopeName(), "scope_dynamic_zoom", FALSE);
             m_zoom_params.m_sUseBinocularVision =
                 READ_IF_EXISTS(pSettings, r_string, GetScopeName(), "scope_alive_detector", 0);
+            m_fRTZoomFactor = m_zoom_params.m_fScopeZoomFactor;
             if (m_UIScope)
             {
                 xr_delete(m_UIScope);