Add empty price settings group in XSD

I did a bit of code digging but couldn't figure out why the price
component definition did not have any valid/configured child nodes for
<settings> whatsoever. I decided that the best route would be to add
blank groups with the proper labels, so that the actual validation
results remain unchanged, but the skeleton now exists for future
developers to add valid configuration.

Author: neillrobson

app/code/Magento/Ui/view/base/ui_component/etc/definition/price.xsd

@@ -12,7 +12,31 @@
     <xs:complexType name="componentPrice">
         <xs:sequence>
             <xs:group ref="configurable" minOccurs="0" maxOccurs="unbounded"/>
+            <xs:element name="settings" minOccurs="0" maxOccurs="1">
+                <xs:complexType>
+                    <xs:choice maxOccurs="unbounded" minOccurs="0">
+                        <xs:group ref="componentPriceSettings"/>
+                    </xs:choice>
+                </xs:complexType>
+            </xs:element>
         </xs:sequence>
         <xs:attributeGroup ref="ui_element_attributes"/>
     </xs:complexType>
+
+    <xs:complexType name="formElementPrice">
+        <xs:sequence>
+            <xs:element name="settings" minOccurs="0" maxOccurs="1">
+                <xs:complexType>
+                    <xs:choice maxOccurs="unbounded" minOccurs="0">
+                        <xs:group ref="componentPriceSettings"/>
+                    </xs:choice>
+                </xs:complexType>
+            </xs:element>
+        </xs:sequence>
+    </xs:complexType>
+
+    <xs:group name="componentPriceSettings">
+        <xs:choice>
+        </xs:choice>
+    </xs:group>
 </xs:schema>