fix(mt): pass boolean LDM resource flag

The resource-acquisition projection calls its field `ldmEnabled`, but the
first implementation passed the three-state `ZSTD_ParamSwitch_e` value
unchanged. `ZSTD_ps_disable` is 2, so Rust interpreted disabled LDM as enabled
and rejected ordinary jobs whose raw sequence store was intentionally absent.
That surfaced as an allocation error on the small stdin compression path.

Convert the C enum to the same boolean semantic used by the Rust policy before
crossing the ABI boundary. The projection declaration also now precedes the
callback setup statements, keeping the native C90 warning-free style.

Test Plan:
- `ulimit -v 41943040; CARGO_BUILD_JOBS=1 cargo clippy --manifest-path rust/Cargo.toml --all-targets -- -D warnings` -- passed
- `ulimit -v 41943040; cargo +nightly fmt --manifest-path rust/Cargo.toml --all -- --check` -- passed
- `git diff --cached --check` -- passed
- The first capped full upstream run failed at `test-zstd` on the small stdin path with the enum/boolean regression; the suite will be rerun after this fix.

lib/compress/zstdmt_compress.c

@@ -1740,13 +1740,13 @@ static size_t ZSTDMT_compressionJobAcquireResources(void* opaque)
     ZSTDMT_compressionJobState* const state =
         (ZSTDMT_compressionJobState*)opaque;
     ZSTDMT_jobDescription* const job = state->job;
+    ZSTDMT_RustCompressionJobResourceProjection const projection = {
+        state->jobParams.ldmParams.enableLdm == ZSTD_ps_enable,
+        job->dstBuff.start != NULL
+    };
 
     state->dstBuff = job->dstBuff;
     DEBUGLOG(5, "ZSTDMT_compressionJob: job %u", job->jobID);
-    ZSTDMT_RustCompressionJobResourceProjection const projection = {
-        state->jobParams.ldmParams.enableLdm,
-        state->dstBuff.start != NULL
-    };
     return ZSTDMT_rust_compressionJobAcquireResources(
             &projection, state,
             ZSTDMT_compressionJobAcquireCCtx,