Remove redundant clone in cairo-lang-test-plugin

[Doryu001]

Bind sierra_program as mutable directly from SierraProgramWithDebug and drop the extra .clone() allocation. Remove the unused std::default::Default import from cairo-lang-test-plugin/src/lib.rs.

[reviewable-StarkWare]

This change is 

[orizi]

Reviewable status: 0 of 1 files reviewed, 1 unresolved discussion

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crates/cairo-lang-test-plugin/src/lib.rs line 162 at r1 (raw file):

 let replacer = DebugReplacer { db }; let mut sierra_program = sierra_program.clone();

the origianl sierra_program is a & - this must be cloned.
please check PRs before adding them.

[orizi]

Reviewable status: 0 of 1 files reviewed, 1 unresolved discussion (waiting on @Doryu001)

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crates/cairo-lang-test-plugin/src/lib.rs line 162 at r1 (raw file):

Previously, orizi wrote…

the origianl sierra_program is a & - this must be cloned.
please check PRs before adding them.

please just close the PR - this is definitely less efficient than before.