Reduce inclusion of FixedVector.h (#21994)

FixedVector class requires use of algorithm include, one of C++'s
heaviest, while in practice it is used only in handful of places.

See #21947 for methodology

372-266=106 #include <algorithm>s fewer

src/openrct2-ui/windows/NewCampaign.cpp

@@ -7,6 +7,7 @@
  * OpenRCT2 is licensed under the GNU General Public License version 3.
  *****************************************************************************/
 
+#include <algorithm>
 #include <openrct2-ui/interface/Dropdown.h>
 #include <openrct2-ui/interface/Widget.h>
 #include <openrct2-ui/windows/Window.h>

src/openrct2/paint/Paint.h

@@ -10,7 +10,6 @@
 #pragma once
 
 #include "../common.h"
-#include "../core/FixedVector.h"
 #include "../drawing/Drawing.h"
 #include "../interface/Colour.h"
 #include "../world/Location.hpp"

src/openrct2/ride/RideConstruction.cpp

@@ -19,6 +19,7 @@
 #include "../actions/RideSetVehicleAction.h"
 #include "../actions/TrackRemoveAction.h"
 #include "../common.h"
+#include "../core/FixedVector.h"
 #include "../entity/EntityList.h"
 #include "../entity/EntityRegistry.h"
 #include "../entity/Staff.h"