Directly check lockscreen redaction flag for redaction

The "LockscreenOtpRedaction.isEnabled" value had a dependency on the
AsyncHybridViewInflation flag. However, only the single-line redacted
view portion of the otp redaction depends on this flag. Add a
"isSingleLineViewEnabled" value that reflects this dependency

Bug: 371843309
Flag: android.app.redact_sensitive_content_notifications_on_lockscreen
Test: manual
Change-Id: I92959a2e0498093e2306d8366adc62ad12a2a43d