Remove check for 'df' as all OS we support will have it installed

fetch

@@ -1012,7 +1012,6 @@ getgtkfont () {
 }
 
 getdisk () {
-    if type -p df >/dev/null 2>&1; then
     # df flags
     case "$os" in
         "Linux" | "Windows") df_flags="-h --total" ;;
@@ -1037,7 +1036,6 @@ getdisk () {
 
     # Put it all together
     disk="${disk_used} / ${disk_total} (${disk_total_per})"
-    fi
 }
 
 getcols () {