libqmi-glib,utils: allow TAB characters as printable in strings

So that instead of this:
  TLV:
    type       = "Model" (0x01)
    length     = 8
    value      = 45:4D:31:32:2D:41:57:09
    translated = EΞE_S%P+Ç

We get this:
  TLV:
    type       = "Model" (0x01)
    length     = 8
    value      = 45:4D:31:32:2D:41:57:09
    translated = EM12-AW