Add option to always direct play Dolby Vision Profile 7 (#670)

## Description
A few devices, like the Nvidia Shield Pro 2019, are able to correctly
handle Dolby Vision Profile 7. However, when a Full Enhancement Layer
(FEL) is present, these devices effectively ignore the enhancement layer
and only apply the RPU metadata.

Due to this behavior, device capabilities are reported as not supporting
`DOVIWithEL`, which causes the Jellyfin server to strip the DV layer
entirely with a remux.

This commit adds an option to force direct play of Dolby Vision Profile
7 content, preventing the server from stripping the Dolby Vision layer
and allowing compatible devices to handle playback as intended.

### Related issues
Fixes https://github.com/damontecres/Wholphin/issues/449

### Screenshots
<img width="1280" height="720" alt="dovi7"
src="https://github.com/user-attachments/assets/849e9897-93b6-419f-a1fb-7f361f9c88dd"
/>

### AI/LLM usage
None

Co-authored-by: Ray <154766448+damontecres@users.noreply.github.com>

app/src/main/java/com/github/damontecres/wholphin/preferences/AppPreference.kt

@@ -414,6 +414,17 @@ sealed interface AppPreference<Pref, T> {
                 summaryOff = R.string.disabled,
             )
 
+        val DirectPlayDoviProfile7 =
+            AppSwitchPreference<AppPreferences>(
+                title = R.string.force_dovi_profile_7,
+                defaultValue = false,
+                getter = { it.playbackPreferences.overrides.directPlayDolbyVisionEL },
+                setter = { prefs, value ->
+                    prefs.updatePlaybackOverrides { directPlayDolbyVisionEL = value }
+                },
+                summary = R.string.force_dovi_profile_7_summary,
+            )
+
         val RememberSelectedTab =
             AppSwitchPreference<AppPreferences>(
                 title = R.string.remember_selected_tab,
@@ -984,6 +995,7 @@ val advancedPreferences =
                                 AppPreference.Ac3Supported,
                                 AppPreference.DirectPlayAss,
                                 AppPreference.DirectPlayPgs,
+                                AppPreference.DirectPlayDoviProfile7,
                             ),
                         ),
                         ConditionalPreferences(