fix copy paste mistake in PreferencesHelper.kt (#2993)

fix copy paste mistake in PreferencesHelper.kt

app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferencesHelper.kt

@@ -88,9 +88,9 @@ class PreferencesHelper(val context: Context) {
 
     fun themeMode() = flowPrefs.getString(Keys.themeMode, Values.THEME_MODE_SYSTEM)
 
-    fun themeLight() = flowPrefs.getString(Keys.themeLight, Values.THEME_DARK_DEFAULT)
+    fun themeLight() = flowPrefs.getString(Keys.themeLight, Values.THEME_LIGHT_DEFAULT)
 
-    fun themeDark() = flowPrefs.getString(Keys.themeDark, Values.THEME_LIGHT_DEFAULT)
+    fun themeDark() = flowPrefs.getString(Keys.themeDark, Values.THEME_DARK_DEFAULT)
 
     fun rotation() = rxPrefs.getInteger(Keys.rotation, 1)