InoToCpp: add ':' to arguments regexp

[mcspr]

Noticed while building .ino files at esp8266 repo
https://github.com/esp8266/Arduino/actions/runs/4578253831/jobs/8084637114?pr=8901#step:5:174

  /tmp/tmpo60cxu_1/src/onewiretest.ino: In function 'void loop()':
  /tmp/tmpo60cxu_1/src/onewiretest.ino:31:2: error: 'checkSwSerial' was not declared in this scope
     31 |  checkSwSerial(&swSer1);
        |  ^~~~~~~~~~~~~
  *** [.pio/build/nodemcuv2/src/onewiretest.ino.cpp.o] Error 1

Where the signature should be

void checkSwSerial(EspSoftwareSerial::UART*);

Locally, to reproduce

> git clone https://github.com/plerup/espsoftwareserial/
> pushd espsoftwareserial/examples/onewiretest
> pio ci -b esp32dev -l "$PWD/../../" ./

[ivankravets]

Thanks for the PR! 🙏