Fix offline dev update confirm handler not starting upload (PhotonVision#2393)

Fixes a bug where offline update did not start after confirming the
dev-version warning dialog.

The confirm action was using an incorrect file reference in template
context, so the selected JAR was not passed correctly to the upload
handler. The dialog closed, but no upload request was sent.
This change corrects the confirm handler so the selected file is passed
properly and the upload/install flow starts as expected.

Author: MirrorCY

photon-client/src/components/settings/DeviceCard.vue

@@ -555,7 +555,7 @@ watch(metricsHistorySnapshot, () => {
               :variant="theme.global.name.value === 'LightTheme' ? 'elevated' : 'outlined'"
               @click="
                 offlineUpdateDialog.show = false;
-                handleOfflineUpdate(offlineUpdate.value.files[0]);
+                handleOfflineUpdate(offlineUpdate.files[0]);
               "
             >
               <v-icon start class="open-icon" size="large"> mdi-upload </v-icon>