fix: save all image fields

licenseId and isUseExplicitlyGrantedByAuthor were missing in the saved
data and are a little tricky because FormData objects only support
string values. Thankfully, DRF supports sensible string values even for
non-string fields.

refs #244

src/components/images/ImagePickerDialog.vue

@@ -113,6 +113,11 @@ const { isProcessing: isSaving, fn: saveAndSelectImage } = useAsyncFunction(
     data.set('ppoi', image.ppoi)
     data.set('altText', image.altText ?? '')
     data.set('credits', image.credits ?? '')
+    data.set('licenseId', image.licenseId ? image.licenseId.toString() : '')
+    data.set(
+      'isUseExplicitlyGrantedByAuthor',
+      image.isUseExplicitlyGrantedByAuthor ? 'true' : 'false',
+    )
     let newOrUpdatedImage: Image
     try {
       if ('id' in image) {