Update generic_clock.c - remove zeroes like guide says

Signed-off-by: its-kronos <140297693+its-kronos@users.noreply.github.com>

Author: its-kronos

variants/STM32F1xx/F103C8T_F103CB(T-U)/generic_clock.c

@@ -21,9 +21,9 @@
   */
 WEAK void SystemClock_Config(void)
 {
-  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
-  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
-  RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};
+  RCC_OscInitTypeDef RCC_OscInitStruct = {};
+  RCC_ClkInitTypeDef RCC_ClkInitStruct = {};
+  RCC_PeriphCLKInitTypeDef PeriphClkInit = {};
 
   /** Initializes the RCC Oscillators according to the specified parameters
   * in the RCC_OscInitTypeDef structure.