[chore] Minor formatting fixes (#7009)

Cf. <https://github.com/koreader/koreader/pull/6992>.

frontend/device/remarkable/device.lua

@@ -167,7 +167,7 @@ end
 local f = io.open("/sys/devices/soc0/machine")
 if not f then error("missing sysfs entry for a remarkable") end
 
-local deviceType = f:read("*line") 
+local deviceType = f:read("*line")
 f:close()
 
 logger.info("deviceType: ", deviceType)

platform/remarkable/koreader.sh

@@ -7,9 +7,9 @@ KOREADER_DIR="${0%/*}"
 cd "${KOREADER_DIR}" || exit
 
 # reMarkable 2 check
-IFS= read -r MACHINE_TYPE < "/sys/devices/soc0/machine"
-if [ "reMarkable 2.0" = "$MACHINE_TYPE" ]; then
-    if [ -z "$RM2FB_SHIM" ]; then
+IFS= read -r MACHINE_TYPE <"/sys/devices/soc0/machine"
+if [ "reMarkable 2.0" = "${MACHINE_TYPE}" ]; then
+    if [ -z "${RM2FB_SHIM}" ]; then
         echo "reMarkable 2 requires RM2FB to work, visit https://github.com/ddvk/remarkable2-framebuffer for instructions how to setup"
         exit 1
     fi