Include sda when detecting usb drive

src/freedombone-utils-setup

@@ -93,6 +93,9 @@ function detect_usb_drive {
     if [[ "$1" == "nopath" ]]; then
         partition_number=''
     fi
+    if [ -b /dev/sda${partition_number} ]; then
+        USB_DRIVE=/dev/sda${partition_number}
+    fi
     if [ -b /dev/sdb${partition_number} ]; then
         USB_DRIVE=/dev/sdb${partition_number}
     fi