[NimManager] fix FBC detection (#3387)

[GitHub]

[NimManager] fix FBC detection (#3387)

-e.g. tuner DVB-C NIM(3128 FBC) Gigablue UE 4K not entry
/proc/stb/frontend/0/fbc_id

root@gbue4k:~# ls -l /proc/stb/frontend/0/
-r--r--r-- 1 root root 0 Feb 26 19:14
static_current_limiting
-r--r--r-- 1 root root 0 Feb 26 19:14
static_current_limiting_choices

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