AK3: flash_* display/output/debug improvements

- tidy up flash_generic block display output to match setup_ak
- add helpful flash_generic debugging stderr for mapper flashing
- hide flash_boot harmless stderr from strings command in TWRP

META-INF/com/google/android/updater-script

@@ -3,4 +3,4 @@
 # Dummy file; update-binary is a shell script (DO NOT CHANGE)
 #
 #
-# AK_BASE_VERSION=20230106
+# AK_BASE_VERSION=20230107