builder/remotecontext: normalize comment formatting

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

builder/remotecontext/remote_test.go

@@ -15,7 +15,7 @@ import (
 	"gotest.tools/fs"
 )
 
-var binaryContext = []byte{0xFD, 0x37, 0x7A, 0x58, 0x5A, 0x00} //xz magic
+var binaryContext = []byte{0xFD, 0x37, 0x7A, 0x58, 0x5A, 0x00} // xz magic
 
 func TestSelectAcceptableMIME(t *testing.T) {
 	validMimeStrings := []string{