[FL-2086] SubGhz: Fix Errors

[Skorpionm]

What's new

• CLI: fix main GUI freeze while subghz chat is running
• CLI: fix processing backspace in the web console
• FL-2086 SubGhz: fix can't save signals in sub'e to internal memory

Verification

• Compile and download
• Go to https://update.flipperzero.one/ in the web console run "subghz chat" and check the backspace ability, and the GUI hangs on the Flipper itself

Checklist (do not modify)

• PR has description of feature/bug or link to Confluence/Jira task
• Description contains actions to verify feature/bugfix
• I've built this code, uploaded it to the device and verified feature/bugfix

[github-actions]

Please fix following code formatting errors:

./applications/subghz/subghz_cli.c:409:59: error: code should be clang-formatted [-Wclang-format-violations]
            } else if((c == CliSymbolAsciiBackspace) || (c== CliSymbolAsciiDel)) {
                                                          ^

You might want to run docker compose exec dev /syntax_check.sh for an auto-fix.

[github-actions]

Click here to flash the b76d394e version of this branch via WebUSB.