Update SD_MMC.cpp (#4020)
According to ESP-IDF API https://github.com/espressif/esp-idf/blob/dc14d027cec49260b78efb1c3724b1710f2f3ec0/docs/en/api-reference/peripherals/sdmmc_host.rst : "To configure the bus width, set the width field of :cpp:class:`sdmmc_slot_config_t`. For example, to set 1-line mode: sdmmc_slot_config_t slot = SDMMC_SLOT_CONFIG_DEFAULT(); slot.width = 1; "
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