test(analyze_rust): add missing browser_extension field to test fixture

The test initialiser at src/assail/analyzer.rs:5345 constructed Analyzer
with only 3 fields (target, language, verbose) but the struct grew a
fourth field (browser_extension: bool) without the inline fixture being
updated. This caused E0063 at every 'cargo test' compile, taking down the
entire test-build even though no test logic was wrong.

One-line fix: default browser_extension to false (matches the production
Analyzer::new() path which also defaults it to false).

Verified: `cargo test --release --lib assail::analyzer -- analyze_rust`
now compiles and all 20 relevant tests pass (including the dangerous-
insecure-decode test whose fixture this is).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

src/assail/analyzer.rs

@@ -5346,6 +5346,7 @@ fn few_unwraps() {
             target: std::path::PathBuf::from("auth.rs"),
             language: crate::types::Language::Rust,
             verbose: false,
+            browser_extension: false,
         };
         let content = r#"
 use jsonwebtoken::{dangerous_insecure_decode, DecodingKey, TokenData};