Adapt upgrade step to addon archive content structure

(see https://fd.winklerfamilie.eu/display/f3ad7b1c-175f-f431-45dd-84c383787445)

seqs/friendica.sh

@@ -117,11 +117,11 @@ step_22() {
   fi
 
   if [ ! -e "$tempExtractAddons" ] ; then
-    exe mkdir -p "$tempDown"
     exe wget -O "$tempLocAddons" $downUrlAddons
     endReturn -o $? "Download failed: $downUrlAddons"
     exe cd "$tempDown"
-    exe tar -xf "$tempLocAddons"
+    exe mkdir -p "$tempExtractAddons"
+    exe tar -xC "${tempExtractAddons}" -f "$tempLocAddons"
     endReturn -o $? "Extract failed: $tempLocAddons"
   else
     echo " [I] Found existing download: $tempExtractAddons"