remove explicit escaping for placeholder opening

src/services/refactors/convertStringOrTemplateLiteral.ts

@@ -198,7 +198,7 @@ namespace ts.refactor.convertStringOrTemplateLiteral {
             index++;
         }
 
-        text = escapeText(text);
+        text = escapeString(text);
         return [index, text, indexes];
     }
 
@@ -247,10 +247,4 @@ namespace ts.refactor.convertStringOrTemplateLiteral {
         }
         return node;
     }
-
-    function escapeText(content: string) {
-        return content.replace("`", "\`")       // back-tick
-                      .replace("${", "$\\{");  // placeholder alike beginning
-    }
-
 }

tests/cases/fourslash/refactorConvertStringOrTemplateLiteral_ToTemplateDollar.ts

@@ -1,12 +0,0 @@
-/// <reference path='fourslash.ts' />
-
-//// const foo = "/*x*/w/*y*/ith ${dollar}"
-
-goTo.select("x", "y");
-edit.applyRefactor({
-    refactorName: "Convert string concatenation or template literal",
-    actionName: "Convert to template literal",
-    actionDescription: "Convert to template literal",
-    newContent:
-"const foo = `with $\\\\{dollar}`",
-});