Add double brackets to if statements

[gmagno]

Fixes #1

[rtng]

thanks a lot unfortunately the issue remains on my side

'rofi -lines 5 -eh 3 -show ddgrsearch -modi "ddgrsearch:ddgr_search.sh" ' still pompts: /usr/local/bin/ddgr_search.sh: Zeile 28: [: : Ganzzahliger Ausdruck erwartet. /usr/local/bin/ddgr_search.sh: Zeile 33: [: : Ganzzahliger Ausdruck erwartet.

' bash -x ddgr_search.sh' now prompts:

• echo -en '\0prompt\x1fddgr\n' promptddgr
• echo -en '\0delim\x1f;' delim;+ [[ '' -eq 1 ]]
• [[ '' -eq 2 ]]