Fixed picker issue where set type caused a reset of a valid array as …

…mentioned here https://stackoverflow.com/questions/51538811/why-doesnt-codenameone-picker-show-chosen-list-items-after-gui-builder

CodenameOne/src/com/codename1/ui/spinner/Picker.java

@@ -778,7 +778,7 @@ public void setType(int type) {
                 }
                 break;
             case Display.PICKER_TYPE_STRINGS:
-                if(!Util.instanceofObjArray(value)) {
+                if(!Util.instanceofObjArray(value) && !(value instanceof String[])) {
                     setStrings(new String[] {" "});
                 }
                 break;