TrimSpace when reading InternalToken from a file (#11502)

InternalTokens are fixed as alphanum strings therefore TrimSpace from these.
Also use isatty to not add a terminal newline when redirecting generate.

Fix #11498

Signed-off-by: Andrew Thornton <art27@cantab.net>

Co-authored-by: Lauris BH <lauris@nix.lv>

modules/setting/setting.go

@@ -1069,7 +1069,7 @@ func loadInternalToken(sec *ini.Section) string {
 			return token
 		}
 
-		return string(buf)
+		return strings.TrimSpace(string(buf))
 	default:
 		log.Fatal("Unsupported URI-Scheme %q (INTERNAL_TOKEN_URI = %q)", tempURI.Scheme, uri)
 	}