Adjust color attachment barrier for dynamic rendering local read sample

[SaschaWillems]

Description

This PR slightly adjusts the barrier for the color attachment in the dynamic rendering local read sample so it matches the one from the (non local read) dynamic rendering sample. See the latest comment in #983

General Checklist:

Please ensure the following points are checked:

• My code follows the coding style
• I have reviewed file licenses
• I have commented any added functions (in line with Doxygen)
• I have commented any code that could be hard to understand
• My changes do not add any new compiler warnings
• My changes do not add any new validation layer errors or warnings
• I have used existing framework/helper functions where possible
• My changes do not add any regressions
• I have tested every sample to ensure everything runs correctly
• This PR describes the scope and expected impact of the changes I am making

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If this PR contains framework changes:

• [n/a] I did a full batch run using the batch command line argument to make sure all samples still work properly