Do not use mocha for wasm targets

It is senseless because for wasm target there is special test framework, and nodejs+wasm can be used only with that special test framework KotlinWasmNode.

Author: ilgonmic

core/build.gradle.kts

@@ -73,22 +73,12 @@ kotlin {
     @OptIn(ExperimentalWasmDsl::class)
     wasmJs {
         nodejs {
-            testTask {
-                useMocha {
-                    timeout = "30000"
-                }
-            }
         }
     }
 
     @OptIn(ExperimentalWasmDsl::class)
     wasmWasi {
         nodejs {
-            testTask {
-                useMocha {
-                    timeout = "30000"
-                }
-            }
         }
     }