map write/read bug fix

[aoki-rt]

What does this implement/fix?

バグの現象
MapManager.hにある迷路マップのサイズのMAPSIZE_X、MAPSIZE_Yを16以外にした時、flashROMの書き込みを失敗する
修正内容.
SPIFFSのマップの読み書きを16で固定してたものをMAPSIZE_X、MAPSIZE_Yに変更した.

Does this close any currently open issues?

ありません

How has this been tested?

MAPSIZE_X、MAPSIZE_Yを4にし、4x4の迷路で実機で試しました

Any other comments?

対象はSTEP8

Checklists

• I have read the CONTRIBUTING guidelines.
  • If there is no guideline in the repository, rt-net organization's guideline applies.
• I have checked to ensure there aren't other open Pull Requests for the same change.

[github-actions]

Memory usage change @ 696b676

Board	flash	%	RAM for global variables	%
esp32:esp32:esp32s3	0 - 0	0.0 - 0.0	0 - 0	0.0 - 0.0

Click for full report table

Board	pico_classic_v4_STEP1_LED flash	%	pico_classic_v4_STEP1_LED RAM for global variables	%	pico_classic_v4_STEP2_SWITCH flash	%	pico_classic_v4_STEP2_SWITCH RAM for global variables	%	pico_classic_v4_STEP3_Buzzer flash	%	pico_classic_v4_STEP3_Buzzer RAM for global variables	%	pico_classic_v4_STEP4_Sensor flash	%	pico_classic_v4_STEP4_Sensor RAM for global variables	%	pico_classic_v4_STEP5_Straight flash	%	pico_classic_v4_STEP5_Straight RAM for global variables	%	pico_classic_v4_STEP6_rotate flash	%	pico_classic_v4_STEP6_rotate RAM for global variables	%	pico_classic_v4_STEP7_P_control flash	%	pico_classic_v4_STEP7_P_control RAM for global variables	%	pico_classic_v4_STEP8_micromouse flash	%	pico_classic_v4_STEP8_micromouse RAM for global variables	%
esp32:esp32:esp32s3	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0

Click for full report CSV

Board,pico_classic_v4_STEP1_LED<br>flash,%,pico_classic_v4_STEP1_LED<br>RAM for global variables,%,pico_classic_v4_STEP2_SWITCH<br>flash,%,pico_classic_v4_STEP2_SWITCH<br>RAM for global variables,%,pico_classic_v4_STEP3_Buzzer<br>flash,%,pico_classic_v4_STEP3_Buzzer<br>RAM for global variables,%,pico_classic_v4_STEP4_Sensor<br>flash,%,pico_classic_v4_STEP4_Sensor<br>RAM for global variables,%,pico_classic_v4_STEP5_Straight<br>flash,%,pico_classic_v4_STEP5_Straight<br>RAM for global variables,%,pico_classic_v4_STEP6_rotate<br>flash,%,pico_classic_v4_STEP6_rotate<br>RAM for global variables,%,pico_classic_v4_STEP7_P_control<br>flash,%,pico_classic_v4_STEP7_P_control<br>RAM for global variables,%,pico_classic_v4_STEP8_micromouse<br>flash,%,pico_classic_v4_STEP8_micromouse<br>RAM for global variables,%
esp32:esp32:esp32s3,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0