Fix specifying runtime for NSwag.Npm resulting in a NConsole.UnusedArgumentException

[ptasev]

Running the following command results in the following exception:

nswag openapi2tsclient /runtime:Net100 /input:../openapi.json /template:angular /InjectionTokenType:InjectionToken /HttpClass:HttpClient /RxJsVersion:6.0 /operationGenerationMode:MultipleClientsFromFirstTagAndOperationId /output:src/service.ts

NConsole.UnusedArgumentException: Unrecognised arguments are present: [Used arguments (7) != Provided arguments (8) -> Check [/runtime:Net100]]
   at NConsole.CommandLineProcessor.ProcessSingleAsync(String[] args, Object input) in /_/src/NSwag.Commands/NConsole/CommandLineProcessor.cs:line 181
   at NConsole.CommandLineProcessor.ProcessAsync(String[] args, Object input) in /_/src/NSwag.Commands/NConsole/CommandLineProcessor.cs:line 120

This commit fixes the problem by removing the runtime argument before passing the args to the dotnet console app. It matches functionality with what the comment says it should be doing on line 63.