🔨 Consolidate BTT linker scripts followup (#22038)

ini/stm32f1-maple.ini

 [env:STM32F103RC_btt_512K_maple]
 platform                  = ${common_stm32f1.platform}
 extends                   = env:STM32F103RC_btt_maple
-board_build.ldscript      = STM32F103RC_SKR_MINI_512K.ld
+board_build.ldscript      = STM32F103RE_SKR_MINI_512K.ld
 board_upload.maximum_size = 524288
 build_flags               = ${env:STM32F103RC_btt_maple.build_flags} -DSTM32_FLASH_SIZE=512