LibGL: Implement `GL_LINEAR_MIPMAP_NEAREST` support

Userland/Libraries/LibGL/SoftwareGLContext.cpp

@@ -2807,6 +2807,10 @@ void SoftwareGLContext::sync_device_sampler_config()
             config.texture_min_filter = SoftGPU::TextureFilter::Nearest;
             config.mipmap_filter = SoftGPU::MipMapFilter::Nearest;
             break;
+        case GL_LINEAR_MIPMAP_NEAREST:
+            config.texture_min_filter = SoftGPU::TextureFilter::Nearest;
+            config.mipmap_filter = SoftGPU::MipMapFilter::Linear;
+            break;
         case GL_NEAREST_MIPMAP_LINEAR:
             config.texture_min_filter = SoftGPU::TextureFilter::Linear;
             config.mipmap_filter = SoftGPU::MipMapFilter::Nearest;