(zilch lang go): fix go file parser with all: go:embed patterns

Technically this isn't quite right, as the full list of files is not
available to the go parser (some files are filtered out too early in
the process), but it should do the job for now.

lang/go/utils/parser/main.go

@@ -258,6 +258,8 @@ func main() {
 		for _, pattern := range pkg.EmbedPatterns {
 			matchedFiles := []string{}
 
+			storePattern := pattern
+
 			// TODO: proper matching
 			if strings.HasPrefix(pattern, "all:") {
 				pattern = pattern[4:]
@@ -293,7 +295,7 @@ func main() {
 				split = append(split, []string{match[len(dir)+1:], dirname, filepath.Base(match)})
 			}
 
-			out.Embeds[pattern] = split
+			out.Embeds[storePattern] = split
 		}
 
 		outfiles[dir] = out