fix: correctly handle interrupt disable on esp32-c3

Priority 0 disables an interrupt on ESP32-C3. This corrects
the code to actually use that.

Signed-off-by: deadprogram <ron@hybridgroup.com>

builder/sizes_test.go

@@ -42,7 +42,7 @@ func TestBinarySize(t *testing.T) {
 	// This is a small number of very diverse targets that we want to test.
 	tests := []sizeTest{
 		// microcontrollers
-		{"hifive1b", "examples/echo", 3668, 280, 0, 2244},
+		{"hifive1b", "examples/echo", 3680, 280, 0, 2252},
 		{"microbit", "examples/serial", 2694, 342, 8, 2248},
 		{"wioterminal", "examples/pininterrupt", 7074, 1510, 120, 7248},