Delete unused file.

tests/empty-expected.wat

@@ -1,13 +0,0 @@
-(module
-  (type (;0;) (func))
-  (type (;1;) (func (result i32)))
-  (func $__wasm_call_ctors (type 0))
-  (func $_start (type 0)
-    call $__wasm_call_ctors)
-  (func $__main_void (type 1) (result i32)
-    i32.const 0)
-  (table (;0;) 1 1 funcref)
-  (memory (;0;) 2)
-  (global (;0;) (mut i32) (i32.const 66560))
-  (export "memory" (memory 0))
-  (export "_start" (func $_start)))