STM32WB: ADC INTERNAL CHANNEL reset after read

Internal channels use is enabling ADC "internal path" which needs
to be disabled after measurement.

Same applied here for WB family as was done for others in #10143.

targets/TARGET_STM/TARGET_STM32WB/analogin_device.c

@@ -190,19 +190,12 @@ uint16_t adc_read(analogin_t *obj)
     }
 
     // Wait end of conversion and get value
+    uint16_t adcValue = 0;
     if (HAL_ADC_PollForConversion(&obj->handle, 10) == HAL_OK) {
-
-        /* Ref Manual: To prevent any unwanted consumption on the battery,
-        it is recommended to enable the bridge divider only when needed for ADC conversion */
-        if (sConfig.Channel == ADC_CHANNEL_VBAT) {
-            CLEAR_BIT(__LL_ADC_COMMON_INSTANCE(obj->handle.Instance)->CCR, LL_ADC_PATH_INTERNAL_VBAT);
-        }
-
-        return (uint16_t)HAL_ADC_GetValue(&obj->handle);
-    } else {
-        debug("ADC conversion failed. Returned 0.\r\n");
-        return 0;
+        adcValue = (uint16_t)HAL_ADC_GetValue(&obj->handle);
     }
+    LL_ADC_SetCommonPathInternalCh(__LL_ADC_COMMON_INSTANCE((&obj->handle)->Instance), LL_ADC_PATH_INTERNAL_NONE);
+    return adcValue;
 }
 
 const PinMap *analogin_pinmap()