re-enable the light theme

close #75
when the light theme is selected, the background is always set to solid, to prevent problems with dark wallpapers

app/src/main/java/de/jrpie/android/launcher/preferences/theme/Background.kt

@@ -16,7 +16,13 @@ enum class Background(val id: Int, val dim: Boolean = false, val blur: Boolean =
     ;
 
     fun applyToTheme(theme: Resources.Theme) {
-        theme.applyStyle(id, true)
+        var background = this
+
+        // force a solid background when using the light theme
+        if (LauncherPreferences.theme().colorTheme() == ColorTheme.LIGHT) {
+            background = SOLID
+        }
+        theme.applyStyle(background.id, true)
     }
 
     fun applyToWindow(window: Window) {

app/src/main/java/de/jrpie/android/launcher/preferences/theme/ColorTheme.kt

@@ -26,7 +26,7 @@ enum class ColorTheme(
         R.style.colorThemeLight,
         R.string.settings_theme_color_theme_item_light,
         R.style.textShadowLight,
-        { false }),
+        { true }),
     DYNAMIC(
         R.style.colorThemeDynamic,
         R.string.settings_theme_color_theme_item_dynamic,

app/src/main/java/de/jrpie/android/launcher/ui/settings/launcher/SettingsFragmentLauncher.kt

@@ -34,6 +34,12 @@ class SettingsFragmentLauncher : PreferenceFragmentCompat() {
         )
         val timeVisible = LauncherPreferences.clock().timeVisible()
         showSeconds?.isVisible = timeVisible
+
+        val background = findPreference<androidx.preference.Preference>(
+            LauncherPreferences.theme().keys().background()
+        )
+        val lightTheme = LauncherPreferences.theme().colorTheme() == ColorTheme.LIGHT
+        background?.isVisible = !lightTheme
     }
 
     override fun onStart() {