fix indxx 255 showing up as black

index 255 shows up black as the uv index goes to 1.0 which is past the
edge of the palette texture. so make the palette wrap clamp to edge

Author: HeliumAnt

Source/Managers/PostProcessMan.cpp

@@ -125,6 +125,8 @@ void PostProcessMan::CreateGLBackBuffers() {
 	GL_CHECK(glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, c_PaletteEntriesNumber, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0));
 	GL_CHECK(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST));
 	GL_CHECK(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST));
+	GL_CHECK(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE));
+	GL_CHECK(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE));
 	UpdatePalette();
 	GL_CHECK(glActiveTexture(GL_TEXTURE0));
 	m_ProjectionMatrix = std::make_unique<glm::mat4>(glm::ortho(0.0F, static_cast<float>(g_WindowMan.GetResX()), 0.0F, static_cast<float>(g_WindowMan.GetResY()), -1.0F, 1.0F));