Fixed omission of comma in string array

Fixing compile error building target "CBL iOS Library" (Xcode 5.1):

/Users/alex/dev/couchbase-lite-ios/Source/API/CBLManager.m:677:76: error: concatenated NSString literal for an NSArray expression - possibly missing a comma [-Werror,-Wobjc-string-concatenation]
    for (NSString* name in @[@"", @"0", @"123foo", @"Foo", @"/etc/passwd", @"foo " @"_foo", longName])