Fix compilation error on ESP32C3

[nicop4]

Fixes the issue #419 & #370 when using the library targeting an ESP32C3 which has only one i2c interface.

The original code has a compilation directive for ESP32 to allow using Wire or Wire1 interface but Wire1 is not present in the SDK of the ESP32C3, resulting in a compilation error.

In the issue #419 it was suggested to adapt the constructor by passing the bus as argument but I could not find a way to pass it and setting a specific geometry.

This solution uses the constant CONFIG_IDF_TARGET_ESP32C3 to prevent the use of Wire1.

Tested on y program on which the build failed, now build and runs perfectly.

I implemented the fix for SSD1306 class because I use this kind of display, but I did the same for SH1106 class, without being able to test it.

[lucasmontec]

I was just going to submit the same PR. Glad to see you made this!
I can confirm this issue does occur with ESP32C3

[lucasmontec]

I tested the same exact fix in my setup and this compiles correctly.

[marcelstoer]

I am ok with this fix.

However, I just wish there was a more generic flag we could rely on. It would be more future-proof if we could say "if has one I2C interface then this, else that". Having to rely on chip names likely means that we'll have to extend the condition to other chips in the future.

I'll need to look into the CI build failures.

[marcelstoer]

Having to rely on chip names likely means that we'll have to extend the condition to other chips in the future.

Indeed, it appears it's same for the C6: meshtastic#16