all: Don't let Suture capture panics (fixes #4758) (#5119)

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cmd/syncthing/main.go

@@ -47,7 +47,7 @@ import (
 	"github.com/syncthing/syncthing/lib/tlsutil"
 	"github.com/syncthing/syncthing/lib/upgrade"
 
-	"github.com/thejerf/suture"
+	"github.com/calmh/suture"
 
 	_ "net/http/pprof" // Need to import this to support STPROFILER.
 )
@@ -594,6 +594,7 @@ func syncthingMain(runtimeOptions RuntimeOptions) {
 		Log: func(line string) {
 			l.Debugln(line)
 		},
+		PanicPanics: true,
 	})
 	mainService.ServeBackground()