Fix OpenGL initialization

src/OpenGL/init.c

@@ -17,7 +17,7 @@ static const EGLint attribs[] =
 	EGL_RED_SIZE, 8,
 	EGL_GREEN_SIZE, 8,
 	EGL_BLUE_SIZE, 8,
-	//EGL_ALPHA_SIZE, 8,
+	EGL_ALPHA_SIZE, 8,
 	//EGL_DEPTH_SIZE, 16,
 	EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
 	EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
@@ -75,4 +75,6 @@ bool init_OpenGL_backend(Instance * instance)
 	//
 	// Restore context
 	eglMakeCurrent(old_display, old_surface_draw, old_surface_read, old_context);
+
+	return true;
 }