Update e2704 code example

[RobertRibayaDx]

Updated ZipReportStorage.cs
Updated ZipReportStorage.vb
Used SaveLayoutToXml method instead of SaveLayout

Tested both projects. Works in v26.1.

[DevExpressExampleBot]

Please correct the project and update this pull request by pushing a new commit.

[BUILDING ERROR]
	OUTPUT: C:\Temp\9f8aee84-c3f8-470c-a3ad-1cd4c4ed6a31\tempTestingCS\ZipReportStorage.cs(36,38): error CS0246: The type or namespace name 'ZipArchive' could not be found (are you missing a using directive or an assembly reference?) [C:\Temp\9f8aee84-c3f8-470c-a3ad-1cd4c4ed6a31\tempTestingCS\ReportStorageSample.csproj]
C:\Temp\9f8aee84-c3f8-470c-a3ad-1cd4c4ed6a31\tempTestingCS\ZipReportStorage.cs(36,61): error CS0103: The name 'ZipArchiveMode' does not exist in the current context [C:\Temp\9f8aee84-c3f8-470c-a3ad-1cd4c4ed6a31\tempTestingCS\ReportStorageSample.csproj]
C:\Temp\9f8aee84-c3f8-470c-a3ad-1cd4c4ed6a31\tempTestingCS\ZipReportStorage.cs(58,42): error CS0246: The type or namespace name 'ZipArchive' could not be found (are you missing a using directive or an assembly reference?) [C:\Temp\9f8aee84-c3f8-470c-a3ad-1cd4c4ed6a31\tempTestingCS\ReportStorageSample.csproj]
C:\Temp\9f8aee84-c3f8-470c-a3ad-1cd4c4ed6a31\tempTestingCS\ZipReportStorage.cs(58,65): error CS0103: The name 'ZipArchiveMode' does not exist in the current context [C:\Temp\9f8aee84-c3f8-470c-a3ad-1cd4c4ed6a31\tempTestingCS\ReportStorageSample.csproj]
C:\Temp\9f8aee84-c3f8-470c-a3ad-1cd4c4ed6a31\tempTestingCS\ZipReportStorage.cs(62,49): error CS0246: The type or namespace name 'ZipArchive' could not be found (are you missing a using directive or an assembly reference?) [C:\Temp\9f8aee84-c3f8-470c-a3ad-1cd4c4ed6a31\tempTestingCS\ReportStorageSample.csproj]
C:\Temp\9f8aee84-c3f8-470c-a3ad-1cd4c4ed6a31\tempTestingCS\ZipReportStorage.cs(62,71): error CS0103: The name 'ZipArchiveMode' does not exist in the current context [C:\Temp\9f8aee84-c3f8-470c-a3ad-1cd4c4ed6a31\tempTestingCS\ReportStorageSample.csproj]
C:\Temp\9f8aee84-c3f8-470c-a3ad-1cd4c4ed6a31\tempTestingCS\ZipReportStorage.cs(165,38): error CS0246: The type or namespace name 'ZipArchive' could not be found (are you missing a using directive or an assembly reference?) [C:\Temp\9f8aee84-c3f8-470c-a3ad-1cd4c4ed6a31\tempTestingCS\ReportStorageSample.csproj]
C:\Temp\9f8aee84-c3f8-470c-a3ad-1cd4c4ed6a31\tempTestingCS\ZipReportStorage.cs(165,61): error CS0103: The name 'ZipArchiveMode' does not exist in the current context [C:\Temp\9f8aee84-c3f8-470c-a3ad-1cd4c4ed6a31\tempTestingCS\ReportStorageSample.csproj]

https://codecentralfarm.devexpress.devx/job/reporting-winforms-custom-report-storage_25.1.3+/24/console