[FIRSTBOOT] fix shell error at L209 + rm prompts pre loop

- shellcheck L209: test_video-2_func()
^-- SC3033 (warning): In POSIX sh, naming functions outside [a-zA-Z_][a-zA-Z0-9_]* is undefined.
- don't call prompts dialog before while loops (doubling)

board/miyoo/boot/firstboot

@@ -206,7 +206,7 @@ test_video_func(){
 	fi
 }
 
-test_video-2_func(){
+test_video2_func(){
 	dialog --defaultno --ok-label NO --cancel-label YES --stdout --title   "   Test Video'2" \
 	--colors --pause "\n\n   \ZuCan you see this message?\Zn\n\nSelect an option & press START" 12 34 10
 
@@ -310,10 +310,8 @@ if ! $FOUND_CONSOLE && ! $FOUND_CONSOLE_AUTO && $CONSOLE_DETECTED; then
 	if (grep -q "$DETECTED_1" "${MOUNTDIR}/uEnv.txt"); then
 		dialog --timeout 3 --msgbox  "Auto-Detected $DETECTED_1" 0 0
 		# Test_Video-prompt if proper miyoo video's version driver was loaded:
-		test_video_func
-
-		# Loop Test_Video until correct selection has been performed (CHOICE=0/3)
-		## former CHOICE=1 meant safe_reboot if correct and shouldn't reach to this point
+		## Loop Test_Video until correct selection has been performed (CHOICE=0/3)
+		### former CHOICE=1 meant safe_reboot if correct and shouldn't reach to this point
 		while true; do
 			test_video_func
 			if !(test $CHOICE -eq -1 || test $CHOICE -eq 1 || test $CHOICE -eq 255); then
@@ -404,9 +402,8 @@ if ! $FOUND_CONSOLE && $FOUND_CONSOLE_AUTO && $CONSOLE_DETECTED; then
 		elif (grep -q "$DETECTED_2" "${MOUNTDIR}/uEnv.txt"); then
 		dialog --timeout 4 --msgbox  "Correcting $DETECTED_2 - wait for further instructions" 0 0
 		fi
-		## Test_Keyboard-prompt if proper miyoo.kbd  version was loaded:
-		test_keyboard_func
-		# Loop Test_Keyboard until correct selection has been performed (CHOICE=0/1)
+		# Test_Keyboard-prompt if proper miyoo.kbd  version was loaded:
+		## Loop Test_Keyboard until correct selection has been performed (CHOICE=0/1)
 		while true; do
 			test_keyboard_func
 			if !(test $CHOICE -eq -1 || test $CHOICE -eq 255); then
@@ -416,7 +413,7 @@ if ! $FOUND_CONSOLE && $FOUND_CONSOLE_AUTO && $CONSOLE_DETECTED; then
 	elif (test "$CONSOLE_VARIANT" == "bittboy" && grep -q "$DETECTED_4" "${MOUNTDIR}/uEnv.txt") ; then
 		dialog --timeout 3 --msgbox  "Auto-Detected $DETECTED_4" 0 0
 		# Test_Video'2-prompt if proper miyoo video's version driver was loaded:
-		test_video-2_func
+		test_video2_func
 	fi
 fi