Add home settings toggle featureflag for enablingTwoLineText

- Have shouldUseTwoLine() be decided with the home settings toggle value

bug:316027081
spec: https://www.figma.com/file/uMzPkNMZpb7EyfHDo8usIa/V-%E2%80%A2-Toast-Butter?type=design&node-id=405-384593&mode=design&t=UBkdeuNlAdRh2FGU-0
Test:
Video: https://drive.google.com/file/d/15VUhNVro2fiwv3SzMda1StiPb3PV1eMT/view?usp=sharing
before searchPreferenceScreen: https://screenshot.googleplex.com/3uqdMsZoGSBYb6c
after searchPreferenceScreen: https://drive.google.com/file/d/15dswiHRTnafyhgQA_tL2tRc7vHFWdHbZ/view?usp=sharing
before homeSettingsPage: https://screenshot.googleplex.com/7wsNevxGun2KCCB
after homeSettingsPage: https://drive.google.com/file/d/15m5bjEyewlNHI_h26aygHa7zrgZ5qDF6/view?usp=sharing
AppListSettingsPage: https://drive.google.com/file/d/15hl4ScHBOLgKv3M38HtatMxQw85pgl7t/view?usp=sharing
Flag: enableTwolineToggle DEVELOPMENT

Change-Id: I3ad133dd51dcb97e14ccded730e7737c5049261a
diff --git a/src/com/android/launcher3/LauncherPrefs.kt b/src/com/android/launcher3/LauncherPrefs.kt
index 3b62ae1..b0a644b 100644
--- a/src/com/android/launcher3/LauncherPrefs.kt
+++ b/src/com/android/launcher3/LauncherPrefs.kt
@@ -349,6 +349,8 @@
         @JvmField
         val PRIVATE_SPACE_APPS =
             nonRestorableItem("pref_private_space_apps", 0, EncryptionType.MOVE_TO_DEVICE_PROTECTED)
+        @JvmField val ENABLE_TWOLINE_ALLAPPS_TOGGLE =
+                backedUpItem("pref_enable_two_line_toggle", false)
         @JvmField
         val THEMED_ICONS =
             backedUpItem(Themes.KEY_THEMED_ICONS, false, EncryptionType.MOVE_TO_DEVICE_PROTECTED)