fix: change storage to memory in Drippie.executable() view function

[ygd58]

Problem

The executable() function in Drippie.sol was using DripState storage state despite being a view function. This violates the view function contract and is semantically incorrect — a view function should not reference storage unnecessarily.

Fix

Changed DripState storage state to DripState memory state on line 174 in the executable() function.

Testing

forge build src/periphery/drippie/Drippie.sol

Compiler run successful.

Closes #224

[cb-heimdall]

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