Remove TERM_PROGRAM from environment because JediTerm does not emulate MacOSX. (#436)

tools/demobench/src/main/kotlin/net/corda/demobench/pty/R3Pty.kt

@@ -47,6 +47,9 @@ class R3Pty(val name: String, settings: SettingsProvider, dimension: Dimension,
         val environment = HashMap<String, String>(envs)
         if (!UIUtil.isWindows) {
             environment["TERM"] = "xterm"
+
+            // This environment variable is specific to MacOSX.
+            environment.remove("TERM_PROGRAM")
         }
 
         val connector = createTtyConnector(args, environment, workingDir)