Fix device-specific logic in install script

These new for loops to check for variants in a list should be checking for the string to _be empty_, not _non-empty_, if a match is found causing the replacement to fire.

bin/device-install.sh

@@ -138,7 +138,7 @@ if [ -f "${FILENAME}" ] && [ -n "${FILENAME##*"update"*}" ]; then
 
 	# littlefs* offset for BigDB 8mb and OTA OFFSET.
 	for variant in "${BIGDB_8MB[@]}"; do
-		if [ -n "${FILENAME##*"$variant"*}" ]; then
+		if [ ! -n "${FILENAME##*"$variant"*}" ]; then
 			OFFSET=0x670000
 			OTA_OFFSET=0x340000
 		fi
@@ -146,7 +146,7 @@ if [ -f "${FILENAME}" ] && [ -n "${FILENAME##*"update"*}" ]; then
 
 	# littlefs* offset for BigDB 16mb and OTA OFFSET.
 	for variant in "${BIGDB_16MB[@]}"; do
-		if [ -n "${FILENAME##*"$variant"*}" ]; then
+		if [ ! -n "${FILENAME##*"$variant"*}" ]; then
 			OFFSET=0xc90000
 			OTA_OFFSET=0x650000
 		fi
@@ -155,7 +155,7 @@ if [ -f "${FILENAME}" ] && [ -n "${FILENAME##*"update"*}" ]; then
 	# Account for S3 board's different OTA partition
 	# FIXME: Use PlatformIO info to determine MCU type, this is unmaintainable
 	for variant in "${S3_VARIANTS[@]}"; do
-		if [ -n "${FILENAME##*"$variant"*}" ]; then
+		if [ ! -n "${FILENAME##*"$variant"*}" ]; then
 			MCU="esp32s3"
 		fi
 	done