platform/technic_hub: fix ADC TIM check

The timer used by the ADC was changed in 5e7a3bf.
This was missed since asserts are not normally enabled.

Author: dlech

lib/pbio/platform/technic_hub/platform.c

@@ -377,7 +377,7 @@ void HAL_ADC_MspInit(ADC_HandleTypeDef *hadc) {
     ADC_ChannelConfTypeDef adc_ch_config = { 0 };
 
     // clocks are enabled in SystemInit
-    assert_param(__HAL_RCC_TIM2_IS_CLK_ENABLED());
+    assert_param(__HAL_RCC_TIM6_IS_CLK_ENABLED());
     assert_param(__HAL_RCC_DMA1_IS_CLK_ENABLED());
     assert_param(__HAL_RCC_ADC1_IS_CLK_ENABLED());