Revert "Remove obsolete TSUIDatabaseConnectionDidUpdateNotification notification."

This reverts commit f2fb2cb9dc.

// FREEBIE

src/Storage/TSStorageManager.h

@@ -13,6 +13,8 @@
 
 NS_ASSUME_NONNULL_BEGIN
 
+extern NSString *const TSUIDatabaseConnectionDidUpdateNotification;
+
 @interface TSStorageManager : NSObject
 
 - (instancetype)init NS_UNAVAILABLE;

src/Storage/TSStorageManager.m

@@ -22,6 +22,8 @@
 
 NS_ASSUME_NONNULL_BEGIN
 
+NSString *const TSUIDatabaseConnectionDidUpdateNotification = @"TSUIDatabaseConnectionDidUpdateNotification";
+
 NSString *const TSStorageManagerExceptionNameDatabasePasswordInaccessible = @"TSStorageManagerExceptionNameDatabasePasswordInaccessible";
 NSString *const TSStorageManagerExceptionNameDatabasePasswordInaccessibleWhileBackgrounded =
     @"TSStorageManagerExceptionNameDatabasePasswordInaccessibleWhileBackgrounded";