Patch circleci config

.circleci/config.yml

             echo testing STM32F1 targets...
             export TEST_PLATFORM="-e STM32F1"
             restore_configs
-            echo use_example_configs STM32F10
-            use_example_configs STM32F10
+            echo use_example_configs STM32/STM32F10
+            use_example_configs STM32/STM32F10
             build_marlin_pio ./ ${TEST_PLATFORM}
             restore_configs
-            echo use_example_configs stm32f103ret6
-            use_example_configs stm32f103ret6
+            echo use_example_configs STM32/stm32f103ret6
+            use_example_configs STM32/stm32f103ret6
             build_marlin_pio ./ ${TEST_PLATFORM}
             restore_configs