Examples: undo adding SDL3 example to Visual Studio sln.

examples/imgui_examples.sln

@@ -29,8 +29,6 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "example_win32_opengl3", "ex
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "example_sdl2_sdlrenderer2", "example_sdl2_sdlrenderer2\example_sdl2_sdlrenderer2.vcxproj", "{0C0B2BEA-311F-473C-9652-87923EF639E3}"
 EndProject
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "example_sdl3_sdlrenderer3", "example_sdl3_sdlrenderer3\example_sdl3_sdlrenderer3.vcxproj", "{C0290D21-3AD2-4A35-ABBC-A2F5F48326DA}"
-EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Win32 = Debug|Win32
@@ -143,14 +141,6 @@ Global
 		{0C0B2BEA-311F-473C-9652-87923EF639E3}.Release|Win32.Build.0 = Release|Win32
 		{0C0B2BEA-311F-473C-9652-87923EF639E3}.Release|x64.ActiveCfg = Release|x64
 		{0C0B2BEA-311F-473C-9652-87923EF639E3}.Release|x64.Build.0 = Release|x64
-		{C0290D21-3AD2-4A35-ABBC-A2F5F48326DA}.Debug|Win32.ActiveCfg = Debug|Win32
-		{C0290D21-3AD2-4A35-ABBC-A2F5F48326DA}.Debug|Win32.Build.0 = Debug|Win32
-		{C0290D21-3AD2-4A35-ABBC-A2F5F48326DA}.Debug|x64.ActiveCfg = Debug|x64
-		{C0290D21-3AD2-4A35-ABBC-A2F5F48326DA}.Debug|x64.Build.0 = Debug|x64
-		{C0290D21-3AD2-4A35-ABBC-A2F5F48326DA}.Release|Win32.ActiveCfg = Release|Win32
-		{C0290D21-3AD2-4A35-ABBC-A2F5F48326DA}.Release|Win32.Build.0 = Release|Win32
-		{C0290D21-3AD2-4A35-ABBC-A2F5F48326DA}.Release|x64.ActiveCfg = Release|x64
-		{C0290D21-3AD2-4A35-ABBC-A2F5F48326DA}.Release|x64.Build.0 = Release|x64
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE