rescue-image: Use only current medkit image name

We used to have two alternative names for medkit image. Currently we are
producing only one of them, so let's stick to that one during download
and speed up the cloud install.

hardware/rescue-image/files/helpers.sh

@@ -109,14 +109,11 @@ download_medkit() {
     for ext in tar.gz tar.gz.sig; do
         i=0
         # We are checking signature, so we don't care about https certificate
-        while ! { \
-            wget --no-check-certificate -O /mnt/src/medkit.$ext https://repo.turris.cz/hbs/medkit/medkit-${BOARD}${MDKT_VARIANT}-latest.$ext || \
-            wget --no-check-certificate -O /mnt/src/medkit.$ext https://repo.turris.cz/hbs/medkit/${BOARD}-medkit${MDKT_VARIANT}-latest.$ext;   \
-            }; do
-                echo "Can't download $BOARD-medkit-latest.$ext :-("
-                sleep 2
-                i="$(expr "$i" + 1)"
-                [ "$i" -lt "$tries" ] || die 2 "Can't get $BOARD-medkit-latest.$ext"
+        while ! wget --no-check-certificate -O /mnt/src/medkit.$ext https://repo.turris.cz/hbs/medkit/${BOARD}-medkit${MDKT_VARIANT}-latest.$ext; do
+            echo "Can't download $BOARD-medkit-latest.$ext :-("
+            sleep 2
+            i="$(expr "$i" + 1)"
+            [ "$i" -lt "$tries" ] || die 2 "Can't get $BOARD-medkit-latest.$ext"
         done
     done
     usign -V -m /mnt/src/medkit.tar.gz -P /etc/opkg/keys || die 2 "Can't validate signature"