kindle: Default NO_EIPS_SLEEP to "yes" ONLY when launched from KUAL

Behaviour guarded by NO_EIPS_SLEEP is by default only applicable to KUAL

Author: ThatHackerDudeFromCyberspace

platform/kindle/koreader.sh

@@ -98,8 +98,6 @@ elif [ "${1}" = "--asap" ]; then
     shift 1
     NO_SLEEP="yes"
     REEXEC_FLAGS="${REEXEC_FLAGS} --asap"
-    # Don't sleep during eips calls either...
-    export EIPS_NO_SLEEP="true"
 else
     NO_SLEEP="no"
 fi

platform/kindle/libkohelper.sh

@@ -57,7 +57,7 @@ eips_print_bottom_centered() {
     # Sleep a tiny bit to workaround the logic in the 'new' (K4+) eInk controllers that tries to bundle updates,
     # otherwise it may drop part of our messages because of other screen updates from KUAL...
     # Unless we really don't want to sleep, for special cases...
-    if [ -z "${EIPS_NO_SLEEP}" ]; then
+    if [ "${FROM_KUAL}" = "yes" ]; then
         usleep 150000 # 150ms
     fi