Fix when removing all the values in the expression editor causes the …

[senithkay]

Purpose

Fix an issue in the Expression Editor where removing all values caused the field to be unexpectedly reset.
Resolves: wso2/product-ballerina-integrator#1953

Goals

Ensure that clearing all values in the Expression Editor does not trigger a reset of the value. The editor should correctly reflect an empty state when all inputs are removed.

Approach

Removed the unnecessary value comparison inside the onChange handler, which was causing the value to reset when clearing all inputs.
Now, the Expression Editor correctly updates its state without reverting to a previous value.

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