ble: card10 svc - lcd display does not need locking anymore

Documentation/bluetooth/card10.rst

@@ -183,7 +183,6 @@ By defining 11x rgb from left to right. You need also to set exchange a bigger M
 LCD brightness characteristic
 ---------------------------------
 This charatieristic set the brightness of the lcd backlight 0-100 in ``uint16``.
-It works only, if no application (pycardium app) blocks the screen.
 
 - set to 100 % ``0x6400``
 - set to 20 % ``0x1400`` (default value)

epicardium/ble/card10.c

@@ -736,14 +736,6 @@ static uint8_t writeCard10CB(
 		}
 		return ATT_SUCCESS;
 	case CARD10_LCD_BRIGHTNESS_VAL_HDL:
-		intVar = epic_disp_open();
-		if (intVar < 0) {
-			APP_TRACE_INFO1(
-				"ble-card10: lock display to set brightness failed: %d",
-				intVar
-			);
-			return ATT_ERR_RANGE;
-		}
 		BYTES_TO_UINT16(ui16, pValue);
 		intVar = epic_disp_backlight(ui16);
 		APP_TRACE_INFO2(
@@ -751,9 +743,6 @@ static uint8_t writeCard10CB(
 			ui16,
 			intVar
 		);
-		epic_disp_close();
-		if (intVar < 0)
-			return ATT_ERR_RANGE;
 		return ATT_SUCCESS;
 	default:
 		APP_TRACE_INFO1(