Language mode reset to C++ after reopening .ino files

[LazarusX]

Steps to reproduce:

1. Double click in the explorer view to open an .ino file.
2. Set the language mode to Arduino.
3. Close and reopen the .ino file.

Issue:
The language mode is reset to C++ after reopening.

[robotdad]

Add the following to your settings and it fixes this.
"files.associations":{
"*.ino":"arduino"
},
"[arduino]":{}

[yaohaizh]

The issue is not relevant any more after #167