Bring back persist argument to openDb

This reverts commit fc1028dba411711c46e3976693552632af4b9dc6.

components/password-prompt.js

@@ -18,7 +18,7 @@ export default class PasswordPrompt extends Component {
       if (hasEncryption) {
         this.setState({showPasswordPrompt: true})
       } else {
-        await openDb()
+        await openDb({persistConnection: true})
         this.props.showApp()
       }
     })
@@ -34,7 +34,7 @@ export default class PasswordPrompt extends Component {
     msg = JSON.parse(msg)
     if (msg.type != 'sha512') return
     try {
-      await openDb(msg.message)
+      await openDb({hash: msg.message, persistConnection: true })
     } catch (err) {
       Alert.alert(
         shared.incorrectPassword,

db/index.js

@@ -161,12 +161,14 @@ export function requestHash(pw) {
   }))
 }
 
-export async function openDb (hash) {
+export async function openDb ({ hash, persistConnection }) {
   if (hash) {
     realmConfig.encryptionKey = hashToInt8Array(hash)
   }
 
-  db = await Realm.open(realmConfig)
+  const connection = await Realm.open(realmConfig)
+
+  if (persistConnection) db = connection
 }
 
 export async function changeEncryptionAndRestartApp(hash) {
@@ -195,7 +197,7 @@ export async function changeEncryptionAndRestartApp(hash) {
 export async function deleteDbAndOpenNew() {
   const exists = await fs.exists(Realm.defaultPath)
   if (exists) await fs.unlink(Realm.defaultPath)
-  await openDb()
+  await openDb({ persistConnection: true })
   await saveEncryptionFlag(false)
 }