Fix setting default activity tracking (#301)

Fixes #299 

Tracking activity was changed to default to `true` in
stashapp/stash#4710, but this app would default
it to `false` if the server didn't provide a value.

The server won't provide a value by default until the user explicitly
changes the setting. This means, for example, a brand new install of
server version `0.26.1` would have server-side tracking enabled but
would not provide the value in the UI config query. So this app would
read it as a `null` value and translate that to `false`.

This PR fixes this behavior so that if the server is at least `0.26.0`
and no value is provided by the server, it will default to true.

app/src/main/java/com/github/damontecres/stashapp/util/ServerPreferences.kt

@@ -54,12 +54,23 @@ class ServerPreferences(private val context: Context) {
         config: ConfigurationQuery.Configuration?,
         serverInfo: ServerInfoQuery.Data?,
     ) {
+        val serverVersion =
+            Version.tryFromString(serverInfo?.version?.version)
         if (config != null) {
             val ui = config.ui as Map<String, *>
             preferences.edit(true) {
                 ui.getCaseInsensitive(PREF_TRACK_ACTIVITY).also {
-                    // If null, toString()=>"null".toBoolean()=>false
-                    putBoolean(PREF_TRACK_ACTIVITY, it.toString().toBoolean())
+                    if (it != null) {
+                        // Use a non-null value from server
+                        putBoolean(PREF_TRACK_ACTIVITY, it.toString().toBoolean())
+                    } else if (serverVersion != null && serverVersion.isAtLeast(Version.V0_26_0)) {
+                        // If server is >=0.26.0 and doesn't provide a value, default to true
+                        // See https://github.com/stashapp/stash/pull/4710
+                        putBoolean(PREF_TRACK_ACTIVITY, true)
+                    } else {
+                        // Server <0.26.0 default to false
+                        putBoolean(PREF_TRACK_ACTIVITY, false)
+                    }
                 }
                 ui.getCaseInsensitive(PREF_MINIMUM_PLAY_PERCENT)?.let {
                     try {