cogl-texture-driver-gles: Fix image height for uploading 3D textures

When uploading a 3D texture with an awkward rowstride, on GLES Cogl
will copy the images to an intermediate buffer to pass to GL. However
it was using the wrong height when copying the data so it would end up
overflowing the buffer and crashing.

cogl/driver/gles/cogl-texture-driver-gles.c

@@ -285,7 +285,7 @@ _cogl_texture_driver_upload_to_gl_3d (GLenum       gl_target,
                                        0, image_height * i,
                                        0, 0,
                                        bmp_width,
-                                       bmp_height);
+                                       height);
 
           data = _cogl_bitmap_bind (bmp,
                                     COGL_BUFFER_ACCESS_READ, 0);