Update lib/js/src/manager/screen/_SoftButtonManagerBase.js

Co-authored-by: renonick87 <renonick87@gmail.com>

Author: crokita

lib/js/src/manager/screen/_SoftButtonManagerBase.js

@@ -60,11 +60,11 @@ class _SoftButtonManagerBase extends _SubManagerBase {
         this._currentMainField1 = null;
         this._currentHmiLevel = null;
         this._batchUpdates = false; // whether to wait on sending the updates
-        this._displayCapabilities = null;
+        let displayCapabilities = null;
         if (lifecycleManager.getSystemCapabilityManager() !== null) {
-            this._displayCapabilities = lifecycleManager.getSystemCapabilityManager().getDisplayCapabilities();
+            displayCapabilities = lifecycleManager.getSystemCapabilityManager().getDisplayCapabilities();
         }
-        this._isDynamicGraphicSupported = (this._displayCapabilities !== null && this._displayCapabilities.getGraphicSupported() !== null) ? this._displayCapabilities.getGraphicSupported() : true;
+        this._isDynamicGraphicSupported = (displayCapabilities !== null && displayCapabilities.getGraphicSupported() !== null) ? displayCapabilities.getGraphicSupported() : true;
 
         this._updateListener = () => {
             this._transitionSoftButton();