rev gallery db extension since our `isValid` checks have changed

SignalServiceKit/src/Storage/OWSMediaGalleryFinder.m

@@ -164,7 +164,7 @@ static NSString *const OWSMediaGalleryFinderExtensionName = @"OWSMediaGalleryFin
     YapDatabaseViewOptions *options = [YapDatabaseViewOptions new];
     options.allowedCollections = [[YapWhitelistBlacklist alloc] initWithWhitelist:[NSSet setWithObject:TSMessage.collection]];
 
-    return [[YapDatabaseAutoView alloc] initWithGrouping:grouping sorting:sorting versionTag:@"2" options:options];
+    return [[YapDatabaseAutoView alloc] initWithGrouping:grouping sorting:sorting versionTag:@"3" options:options];
 }
 
 + (BOOL)attachmentIdShouldAppearInMediaGallery:(NSString *)attachmentId transaction:(YapDatabaseReadTransaction *)transaction