Fix gcc search path in make-ota.sh (#1688)

Author: oddstr13

ota/make-ota.sh

@@ -3,7 +3,7 @@
 set -e # Exit on error
 
 export PICO_SDK_PATH="$(cd ../pico-sdk/; pwd)"
-export PATH="$(cd ../../system/arm-none-eabi/bin; pwd):$PATH"
+export PATH="$(cd ../system/arm-none-eabi/bin; pwd):$PATH"
 
 rm -rf build
 mkdir build