OpenGL: value-initialize variables which cause uninitialised access otherwise

src/video_core/renderer_opengl/gl_rasterizer.h

@@ -413,7 +413,7 @@ private:
         UniformData data;
         bool lut_dirty[6];
         bool dirty;
-    } uniform_block_data;
+    } uniform_block_data = {};
 
     std::array<SamplerInfo, 3> texture_samplers;
     OGLVertexArray vertex_array;
@@ -422,5 +422,5 @@ private:
     OGLFramebuffer framebuffer;
 
     std::array<OGLTexture, 6> lighting_luts;
-    std::array<std::array<GLvec4, 256>, 6> lighting_lut_data;
+    std::array<std::array<GLvec4, 256>, 6> lighting_lut_data{};
 };