Fix dynamic parameters bug. #744

Fix dynamic parameters bug.

Usage Workflow file

15 warnings

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Test: src/eval/global_state.rs#L179

method `iter_imports_raw` is never used

Test: src/serde/ser.rs#L18

field `key` is never read

`rhai` (lib test) generated 2 warnings (2 duplicates)

Test: tests/side_effects.rs#L2

unused import: `Scope`

Test: tests/side_effects.rs#L6

struct `Command` is never constructed

Test: tests/types.rs#L11

variable does not need to be mutable

Test: tests/side_effects.rs#L13

methods `action` and `get` are never used

Test: tests/side_effects.rs#L23

type alias `API` is never used

`rhai` (test "types") generated 1 warning (run `cargo fix --test "types"` to apply 1 suggestion)

Test: examples/custom_types.rs#L8

unused imports: `CustomType`, `Engine`, `EvalAltResult`, `TypeBuilder`

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