Disable gnusocial and postactiv on onion only installs

There are database problems possibly related to being primarily on an onion address

src/freedombone-app-gnusocial

 }
 
 function install_gnusocial {
-    if [ ! "$ONION_ONLY" ]; then
-        ONION_ONLY='no'
+    if [[ "$ONION_ONLY" != 'no' ]]; then
+        return
     fi
 
     install_gnusocial_main

src/freedombone-app-postactiv

 }
 
 function install_postactiv {
-    if [ ! "$ONION_ONLY" ]; then
-        ONION_ONLY='no'
+    if [[ "$ONION_ONLY" != 'no' ]]; then
+        return
     fi
 
     install_postactiv_main