fix: rename OptionFilter -> optionFilter (#190)

Author: QRuhier

src/main/resources/xsd/Questionnaire.xsd

@@ -612,10 +612,10 @@
          </xs:documentation>
        </xs:annotation>
       </xs:element>
-      <xs:element name="OptionFilter" type="xs:string" minOccurs="0">
+      <xs:element name="optionFilter" type="xs:string" minOccurs="0">
         <xs:annotation>
           <xs:documentation>
-            OptionFilter defines a VTL expression used to dynamically filter
+            optionFilter defines a VTL expression used to dynamically filter
             response options when the choiceType is set to VARIABLE.
             For CODE_LIST questions, filtering must be defined at the individual
             option level.</xs:documentation>

src/test/java/fr/insee/pogues/model/UniqueChoiceVariableOptionsTest.java

@@ -43,7 +43,7 @@ void serializeUcqVariable_withFilter() throws JAXBException, UnsupportedEncoding
               "Response": [
                 {
                   "VariableReference": "id-loop-variable",
-                  "OptionFilter": "nvl($AGE$, 0) > 18",
+                  "optionFilter": "nvl($AGE$, 0) > 18",
                   "choiceType": "VARIABLE"
                 }
               ]
@@ -117,7 +117,7 @@ void deserializeUcqVariable_withFilter() throws JAXBException {
                    "Response": {
                        "choiceType": "VARIABLE",
                        "VariableReference": "id-loop-variable",
-                       "OptionFilter": "nvl($AGE$, 0) > 18"
+                       "optionFilter": "nvl($AGE$, 0) > 18"
                    }
                  }
                ]