DT runner:Fix $ExpectError handling
DT runner:Fix $ExpectError handling

Indices into lines of the file are zero-based, but the errors reporting
by Typescript are one-based. Also, the regex ignored $ExpectError in tsx
files.

donaldpipowitch/TypeScript,alexeagle/TypeScript,Microsoft/TypeScript,nojvek/TypeScript,donaldpipowitch/TypeScript,donaldpipowitch/TypeScript,microsoft/TypeScript,alexeagle/TypeScript,SaschaNaz/TypeScript,weswigham/TypeScript,basarat/TypeScript,nojvek/TypeScript,RyanCavanaugh/TypeScript,donaldpipowitch/TypeScript,RyanCavanaugh/TypeScript,minestarks/TypeScript,microsoft/TypeScript,kpreisser/TypeScript,kitsonk/TypeScript,microsoft/TypeScript,Microsoft/TypeScript,basarat/TypeScript,nojvek/TypeScript,nojvek/TypeScript,SaschaNaz/TypeScript,SaschaNaz/TypeScript,basarat/TypeScript,kpreisser/TypeScript,RyanCavanaugh/TypeScript,minestarks/TypeScript,SaschaNaz/TypeScript,alexeagle/TypeScript,Microsoft/TypeScript,minestarks/TypeScript,kitsonk/TypeScript,weswigham/TypeScript,weswigham/TypeScript,basarat/TypeScript,kitsonk/TypeScript,kpreisser/TypeScript