fix: Source maps not correctly referenced.

Removed the inputFilePath variable that is no longer needed and was causing lint to fail.

angular#1266

Author: wholladay

lib/broccoli/broccoli-typescript.js

@@ -195,7 +195,6 @@ class BroccoliTypeScriptCompiler extends Plugin {
 
   _outputFile(absoluteFilePath, fileContent, registry) {
     absoluteFilePath = path.resolve(this.cachePath, absoluteFilePath);
-    let inputFilePath = absoluteFilePath;
     // Replace the input path by the output.
     absoluteFilePath = absoluteFilePath.replace(this.inputPaths[0], this.cachePath);
     const outputFilePath = absoluteFilePath.replace(this.cachePath, this.outputPath);