fix: some examples not calling alvik.stop() before sys.exit

Author: eigen-value

examples/leds_setting.py

@@ -37,4 +37,5 @@
         sleep_ms(1000)
     except KeyboardInterrupt as e:
         print('over')
+        alvik.stop()
         sys.exit()

examples/read_color_sensor.py

@@ -13,5 +13,5 @@
         sleep_ms(100)
     except KeyboardInterrupt as e:
         print('over')
-        break
-sys.exit()
+        alvik.stop()
+        sys.exit()

examples/read_touch.py

@@ -27,5 +27,5 @@
         sleep_ms(100)
     except KeyboardInterrupt as e:
         print('over')
-        break
-sys.exit()
+        alvik.stop()
+        sys.exit()

examples/set_pid.py

@@ -14,5 +14,5 @@
         sleep_ms(100)
     except KeyboardInterrupt as e:
         print('over')
-        break
-sys.exit()
+        alvik.stop()
+        sys.exit()