Set VST3 filename for wasm builds

Signed-off-by: falkTX <falktx@falktx.com>

Makefile.plugins.mk

@@ -121,6 +121,8 @@ VST3_FILENAME = $(NAME).vst3/Contents/$(TARGET_PROCESSOR)-linux/$(NAME).so
 else ifeq ($(MACOS),true)
 VST3_CONTENTS = $(NAME).vst3/Contents
 VST3_FILENAME = $(VST3_CONTENTS)/MacOS/$(NAME)
+else ifeq ($(WASM),true)
+VST3_FILENAME = $(NAME).vst3/Contents/wasm/$(NAME).vst3
 else ifeq ($(WINDOWS),true)
 ifeq ($(CPU_I386),true)
 VST3_FILENAME = $(NAME).vst3/Contents/x86-win/$(NAME).vst3