🐛 Fix env:STM32F103RE maple/unified split-up (#22019)

Followup to #21999

ini/stm32f1-maple.ini

@@ -131,9 +131,9 @@ lib_deps          = ${env:STM32F103RC_btt_512K_maple.lib_deps}
   USBComposite for STM32F1@0.91
 
 #
-# STM32F103RE with Unified STM32F1 HAL
+# Generic STM32F103RE environment
 #
-[common_STM32F103RE]
+[env:STM32F103RE_maple]
 platform          = ${common_stm32f1.platform}
 extends           = common_stm32f1
 board             = genericSTM32F103RE
@@ -144,7 +144,7 @@ monitor_speed     = 115200
 #
 [env:STM32F103RET6_creality_maple]
 platform             = ${common_stm32f1.platform}
-extends              = common_STM32F103RE
+extends              = env:STM32F103RE_maple
 build_flags          = ${common_stm32f1.build_flags} -DTEMP_TIMER_CHAN=4
 board_build.address  = 0x08007000
 board_build.ldscript = creality.ld
@@ -160,7 +160,7 @@ upload_protocol      = jlink
 #
 [env:STM32F103RE_btt]
 platform          = ${common_stm32f1.platform}
-extends           = common_STM32F103RE
+extends           = env:STM32F103RE_maple
 board_build.address  = 0x08007000
 board_build.ldscript = STM32F103RE_SKR_E3_DIP.ld
 extra_scripts     = ${common_stm32f1.extra_scripts}