cmd/compile: update fmt_test.go for esc.go code cleanup

CL 187598 removed a bunch of esc.go's debug messages, so some format
strings are no longer needed.

Fixes #33915.

Change-Id: Iaadf12b5d68358e1abb00210f5aa8be01b36ce82
Reviewed-on: https://go-review.googlesource.com/c/go/+/192142
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/cmd/compile/fmtmap_test.go

@@ -26,7 +26,6 @@ var knownFormats = map[string]string{
 	"*cmd/compile/internal/gc.Node %#v":               "",
 	"*cmd/compile/internal/gc.Node %+S":               "",
 	"*cmd/compile/internal/gc.Node %+v":               "",
-	"*cmd/compile/internal/gc.Node %0j":               "",
 	"*cmd/compile/internal/gc.Node %L":                "",
 	"*cmd/compile/internal/gc.Node %S":                "",
 	"*cmd/compile/internal/gc.Node %j":                "",
@@ -88,8 +87,6 @@ var knownFormats = map[string]string{
 	"cmd/compile/internal/gc.Class %v":                "",
 	"cmd/compile/internal/gc.Ctype %d":                "",
 	"cmd/compile/internal/gc.Ctype %v":                "",
-	"cmd/compile/internal/gc.Level %d":                "",
-	"cmd/compile/internal/gc.Level %v":                "",
 	"cmd/compile/internal/gc.Nodes %#v":               "",
 	"cmd/compile/internal/gc.Nodes %+v":               "",
 	"cmd/compile/internal/gc.Nodes %.v":               "",
@@ -181,7 +178,6 @@ var knownFormats = map[string]string{
 	"string %-*s":          "",
 	"string %-16s":         "",
 	"string %-6s":          "",
-	"string %.*s":          "",
 	"string %q":            "",
 	"string %s":            "",
 	"string %v":            "",
@@ -192,7 +188,6 @@ var knownFormats = map[string]string{
 	"uint %d":              "",
 	"uint %x":              "",
 	"uint16 %d":            "",
-	"uint16 %v":            "",
 	"uint16 %x":            "",
 	"uint32 %#x":           "",
 	"uint32 %d":            "",