revert InjectGlobal annotation

- Should not annotate InjectGlobal.
- Remove InjectGlobal test fixture.

Author: Osama Jandali

src/visitors/uglifyPure.js

@@ -1,18 +1,16 @@
 import annotateAsPure from "@babel/helper-annotate-as-pure"
 
 import { useUglifyPure } from '../utils/options'
-import { isStyled, isHelper, isInjectGlobalHelper } from '../utils/detectors'
+import { isStyled, isHelper } from '../utils/detectors'
 
 export default (path, state) => {
     if(useUglifyPure(state)){
         if(isStyled(path.node,state) || 
           isStyled(path.node.callee,state) || 
-          isHelper(path.node.callee,state) ||
-          isInjectGlobalHelper(path.node.callee,state) 
+          isHelper(path.node.callee,state) 
         ){
             if(path.parent.type == 'VariableDeclarator' || 
-              path.parent.type == 'TaggedTemplateExpression' ||
-              path.parent.type =='ExpressionStatement'
+              path.parent.type == 'TaggedTemplateExpression'
             ){
                 annotateAsPure(path)
             }

test/__snapshots__/index.test.js.snap

@@ -117,8 +117,6 @@ const DoubleInterpolation = /*#__PURE__*/styled.div.withConfig({
 })([[\"{margin:\", props => props.vert, \" \", props => props.hori, \";}\"]]);"
 `;
 
-exports[`fixtures should annotate inject global with uglify pure comments 1`] = `"/*#__PURE__*/injectGlobal([[\"\", glob, \"\\n/*! preserve comment */html,body{margin:100000px;padding:\", test, \";}@media (max-width:999px){html,body{margin:0;}}.root{width:100%;}\"]]);"`;
-
 exports[`fixtures should annotate keyframes with uglify pure comments 1`] = `"const Animation = /*#__PURE__*/keyframes([[\"@-webkit-keyframes \"], [\"{0%{opacity:0;}100%{opacity:1;}}@keyframes \"], [\"{0%{opacity:0;}100%{opacity:1;}}\"]]);"`;
 
 exports[`fixtures should annotate styled calls with uglify pure comments 1`] = `