Normalize repeater target names

variants/waveshare_rp2040_lora/platformio.ini

@@ -33,7 +33,7 @@ build_src_filter = ${rp2040_base.build_src_filter}
   +<../variants/waveshare_rp2040_lora>
 lib_deps = ${rp2040_base.lib_deps}
 
-[env:waveshare_rp2040_lora_Repeater]
+[env:waveshare_rp2040_lora_repeater]
 extends = waveshare_rp2040_lora
 build_flags = ${waveshare_rp2040_lora.build_flags}
   -D ADVERT_NAME='"RP2040-LoRa Repeater"'