Make sure showgbr module in i3staplus does not break JSON syntax

dotfiles/config/i3/bin/i3staplus

 
 gibrs() {
     local out
-    out=$(showgbr)
+    out=$(showgbr | head -1 | sed 's/"/\\"/')
     test -n "$out" || return 0
     printf '{"full_text": "ⓖ %s"},' \
        "$out"