build: set v8_enable_webassembly=false when lite mode is enabled
We should set v8_enable_webassembly=false when lite mode is enabled, since v8_enable_lite_mode implies v8_jitless, and wasm currently doesn't work with jitless. This is automatically handled in gn, but seems to be not the case in gyp. Enabling lite mode without setting v8_enable_webassembly=false leads to "Warning: disabling flag --expose_wasm due to conflicting flags" at runtime.