[fix][clang-tidy] Fix env var replace for extra args

[Jonah-E]

Running codechecker and giving extra arguments for clang-tidy containing environmental variables fails. This issue seems to stem from that env.replace_env_var is use without an argument in analyzer/codechecker_analyzer/analyzers/clangtidy/analyzer.py. This should fix it.

To reproduce the issue, run the following:
With the file main.c containing:

#include <stdio.h>

int main(void){
  int i = BUILDVAR;
  printf("Hello world!\n\tBUILDVAR=%d\n", i  );
  return 0;
}

and the file `.clangtidy_extra_flags.txt containing:

--extra-arg="-DBUILDVAR=$(MY_ENV_VAR)"

1. Set the environmental varible MY_ENV_VAR

export MY_ENV_VAR=55

2. Run the following command

CodeChecker check -b "gcc main.c -DBUILDVAR=$MY_ENV_VAR" --tidyargs .clangtidy_extra_flags.txt

This should fail with TypeError: sequence item 1: expected str instance, function found