Use `upload_protocol = esptool` as with the other heltec devices...

[mkgin]

Use upload_protocol = esptool as with the other heltec devices instead of esp-builtin

• consistent with other heltec devices
• majority of esp32 already use esptool
• esptool seems slightly faster (same cable, no other configuration changes)

$ grep "Programming Finished" tracker_upload_protocol_esp-builtin3.log 
** Programming Finished in 21990 ms **
** Programming Finished in 1341 ms **
** Programming Finished in 1110 ms **
** Programming Finished in 1167 ms **

$ grep Wrote tracker_upload_protocol_esptool_3.log 
Wrote 15104 bytes (10430 compressed) at 0x00000000 in 0.2 seconds (effective 486.0 kbit/s)...
Wrote 3072 bytes (137 compressed) at 0x00008000 in 0.0 seconds (effective 575.4 kbit/s)...
Wrote 8192 bytes (47 compressed) at 0x0000e000 in 0.1 seconds (effective 767.1 kbit/s)...
Wrote 1869536 bytes (1182304 compressed) at 0x00010000 in 13.0 seconds (effective 1148.7 kbit/s)...

[thebentern]

Fair. I have better luck with esptool anyway

[mkgin]

Fair. I have better luck with esptool anyway

My experience also. I was about to mention potential issues with esp-builtin but it logs to stderr unlike stdout. I didn't have logs or anything remaining in the terminal buffer.