fix(xml): chart and slider minor fixes

xmls/lv_chart.xml

@@ -28,6 +28,8 @@
 	        <enum name="secondary_y"/>
 	    </enumdef>
 
+	    <prop name="type" type="enum:lv_chart_type" help=""/>
+
 	    <prop name="point_count" help="">
 	    	<param name="count" type="int" help=""/>
 	    </prop>

xmls/lv_slider.xml

@@ -17,7 +17,7 @@ Example
 	    </prop>
 
 	    <prop name="value">
-	    	<param name="range_min" type="int"/>
+	    	<param name="value" type="int"/>
 	    	<param name="anim" type="bool" default="false"/>
 	    </prop>