Rename Example File DiyIndoorProV3_7

[airgradienthq]

We should rename DiyIndoorProV3_7 to DiyIndoorProV3_7 to DiyIndoorProV3_3 because only 3.3 and before do not have the push button.

3.7 has a push button but is differently wired from 4.2.

Please rename on:
File/Directory name of example file
Identifier for PCB/model in code

[pnt325]

@airgradienthq schematic of DIY-Pro 3.7. Now I rename example 3.7 to 3.3 wait for you schematic to add new example for 3.7

[airgradienthq]

We will not have 3.7 right now.