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nixos/esphome: add state directory to ExecPaths= and ReadWritePaths=
Fixes the following issue:
```
sh: line 1: /var/lib/esphome/.platformio/packages/toolchain-gccarmnoneeabi/bin/arm-none-eabi-g++: Permission denied
```
Signed-off-by:
David Wronek <david.wronek@mainlining.org>