win-capture: Fix enum switch warnings

The enum switch warning is used to signify when you are missing
enum values.

plugins/win-capture/graphics-hook/d3d9-capture.cpp

@@ -98,7 +98,7 @@ static void d3d9_free()
 
 static DXGI_FORMAT d3d9_to_dxgi_format(D3DFORMAT format)
 {
-	switch (format) {
+	switch ((unsigned long)format) {
 	case D3DFMT_A2B10G10R10: return DXGI_FORMAT_R10G10B10A2_UNORM;
 	case D3DFMT_A8R8G8B8:    return DXGI_FORMAT_B8G8R8A8_UNORM;
 	case D3DFMT_X8R8G8B8:    return DXGI_FORMAT_B8G8R8X8_UNORM;

plugins/win-capture/graphics-hook/dxgi-helpers.hpp

@@ -2,7 +2,7 @@
 
 static inline DXGI_FORMAT fix_dxgi_format(DXGI_FORMAT format)
 {
-	switch (format) {
+	switch ((unsigned long)format) {
 		case DXGI_FORMAT_B8G8R8A8_UNORM_SRGB:
 			return DXGI_FORMAT_B8G8R8A8_UNORM;
 		case DXGI_FORMAT_R8G8B8A8_UNORM_SRGB: