Fixed inverted wasm-opt condition (#3930)

# Description of Changes

Reverted the incorrect inversion of `build_debug` condition introduced
by
bb43213
that resulted in only debug builds being optimized instead of only
release ones, as the comment just below says.

# API and ABI breaking changes

None.

# Expected complexity level and risk

### 1.

# Testing

- [x] Manual testing
- [x] Personal experience (saw `.opt.wasm` files disappear at some
point)

Author: egormanga

crates/cli/src/tasks/mod.rs

@@ -27,7 +27,7 @@ pub fn build(
 
     if lang == ModuleLanguage::Javascript {
         Ok((output_path, "Js"))
-    } else if !build_debug {
+    } else if build_debug {
         Ok((output_path, "Wasm"))
     } else {
         // for release builds, optimize wasm modules with wasm-opt