Removed app name uniqueness

src/freedombone-utils-selector

     if [ ! -f $REMOVED_APPS_FILE ]; then
         touch $REMOVED_APPS_FILE
     fi
-    if ! grep -Fxq "$app_name" $REMOVED_APPS_FILE; then
-        echo "$app_name" >> $REMOVED_APPS_FILE
+    if ! grep -Fxq "-$app_name" $REMOVED_APPS_FILE; then
+        echo "-$app_name" >> $REMOVED_APPS_FILE
     fi
 }
 
         return
     fi
 
-    if ! grep -Fxq "$app_name" $REMOVED_APPS_FILE; then
+    if ! grep -Fxq "-$app_name" $REMOVED_APPS_FILE; then
         echo "0"
     else
         echo "1"
         return
     fi
     if [[ $(app_is_removed $app_name) == "1" ]]; then
-        sed -i "/${app_name}/d" $REMOVED_APPS_FILE
+        sed -i "/-${app_name}/d" $REMOVED_APPS_FILE
     fi
 }