test/spectest.wat: update to match the spec harness

cf. WebAssembly/spec#1718

Author: yamt

test/spectest.wat

@@ -18,8 +18,8 @@ https://github.com/WebAssembly/spec/blob/d48af683f5e6d00c13f775ab07d29a15daf9220
     (func (export "print_f64") (param f64))
     (global (export "global_i32") i32 (i32.const 666))
     (global (export "global_i64") i64 (i64.const 666))
-    (global (export "global_f32") f32 (f32.const 666))
-    (global (export "global_f64") f64 (f64.const 666))
+    (global (export "global_f32") f32 (f32.const 666.6))
+    (global (export "global_f64") f64 (f64.const 666.6))
     (table (export "table") 10 20 funcref)
     (memory (export "memory") 1 2)
 )