cabana: use different surface format for chart and cameraview

[deanlee]

@pd0wm does this fix the opengl issue on mac?

[pd0wm]

It segfaults on startup:

tools/cabana/_cabana --demo
services  std::vector(can, roadEncodeIdx, carParams, wideRoadEncodeIdx)
loading route  "4cf7a6ad03080c90|2021-09-29--13-46-36"
load route 4cf7a6ad03080c90|2021-09-29--13-46-36 with 11 valid segments
seeking to 0 s, segment 0
loading segment 0...
connecting to stream 0, was connected to 0
UNSUPPORTED (log once): POSSIBLE ISSUE: unit 0 GLD_TEXTURE_INDEX_2D is unloadable and bound to sampler type (Float) - using zero texture because texture unloadable
Starting listener for: camerad
[1]    87891 segmentation fault  tools/cabana/_cabana --demo