Params plugin: Don't install plugin before test

Signed-off-by: Tomasz Michalak <tmichalak@antmicro.com>

params-plugin/Makefile

diff --git a/params-plugin/Makefile b/params-plugin/Makefile
index d0fd047..1cce085 100644
--- a/params-plugin/Makefile
+++ b/params-plugin/Makefile
@@ -13,7 +13,7 @@
 	mkdir -p $(PLUGINS_DIR)
 	cp $< $(PLUGINS_DIR)/$<
 
-test: install_plugin
+test:
 	$(MAKE) -C tests all
 
 .PHONY: install