Delete redundant test

Author: amcasey

src/testRunner/unittests/tsc/listFilesOnly.ts

@@ -2,17 +2,7 @@ namespace ts {
     describe("unittests:: tsc:: listFilesOnly::", () => {
         verifyTsc({
             scenario: "listFilesOnly",
-            subScenario: "before watch",
-            fs: () => loadProjectFromFiles({
-                "/src/test.ts": utils.dedent`
-                        export const x = 1;`,
-            }),
-            commandLineArgs: ["/src/test.ts", "--listFilesOnly", "--watch"]
-        });
-
-        verifyTsc({
-            scenario: "listFilesOnly",
-            subScenario: "after watch",
+            subScenario: "combined with watch",
             fs: () => loadProjectFromFiles({
                 "/src/test.ts": utils.dedent`
                         export const x = 1;`,