Require SD card or >4MB flash (#545)

Devices/waveshare-s3-touch-lcd-43/device.properties

@@ -4,7 +4,8 @@ general.name=S3 Touch LCD 4.3"
 apps.launcherAppId=Launcher
 
 hardware.target=ESP32S3
-hardware.flashSize=4MB
+# Some models have 16MB flash, but some have 8MB. We only support the latter to avoid making more builds.
+hardware.flashSize=8MB
 hardware.spiRam=true
 hardware.spiRamMode=OCT
 hardware.spiRamSpeed=120M
@@ -12,6 +13,8 @@ hardware.tinyUsb=true
 hardware.esptoolFlashFreq=120M
 hardware.bluetooth=true
 
+storage.userDataLocation=Internal
+
 display.size=4.3"
 display.shape=rectangle
 display.dpi=217