test: fixtures - use {} instead of empty package.json

Author: aminya

spec/fixtures/indirect-local-eslint/testing/eslint/lib/package.json

@@ -0,0 +1 @@
+{}

spec/fixtures/indirect-local-eslint/testing/eslint/package.json

@@ -0,0 +1 @@
+{}

spec/fixtures/local-eslint/lib/package.json

@@ -0,0 +1 @@
+{}

spec/fixtures/local-eslint/package.json

@@ -0,0 +1 @@
+{}