fix(hamlog): read the site's own confirmation field, not a guessed one

A real record from their export settles it:

	<CALL:4>RL6M … <CNTY:5>RO-19 <APP_HAMLOG_R150COUNTRY:6>Russia
	<APP_HAMLOG_QSO_CFM:1>Y

The confirmation lives in APP_HAMLOG_QSO_CFM. The four names guessed before a
file was available — APP_HAMLOG_QSL and friends — were all wrong, which is the
argument for reading one rather than reasoning about it.

So that becomes the canonical key everywhere: the award source, the row colours,
the grid column and the bulk editor. Importing a log downloaded from HAMLOG now
carries its confirmations into OpsLog with nothing to rename. The older names,
including the APP_OPSLOG_HAMLOG_QSL that OpsLog itself wrote in the meantime,
are still honoured on read so nothing already stamped stops counting.

internal/award/confirm_test.go

@@ -95,3 +95,30 @@ func TestHamlogConfirmationSource(t *testing.T) {
 		t.Error("a hamlog confirmation counted for an award that only accepts LoTW")
 	}
 }
+
+// The field name is theirs, taken from a real export:
+//
+//	<APP_HAMLOG_QSO_CFM:1>Y
+//
+// Pinned as a test because it was GUESSED wrong first — an import that carries
+// its confirmations into OpsLog with nothing to rename is the whole point, and
+// a renamed constant would break it in silence.
+func TestHamlogUsesTheSitesOwnFieldName(t *testing.T) {
+	if HamlogQSLKey != "APP_HAMLOG_QSO_CFM" {
+		t.Fatalf("HamlogQSLKey = %q — their export writes APP_HAMLOG_QSO_CFM", HamlogQSLKey)
+	}
+	def := Def{Confirm: []string{"hamlog"}}
+	// The record as HAMLOG exports it.
+	q := &qso.QSO{Extras: map[string]string{
+		"APP_HAMLOG_R150COUNTRY": "Russia",
+		"APP_HAMLOG_QSO_CFM":     "Y",
+	}}
+	if !Confirmed(q, def, def.Confirm) {
+		t.Error("a real HAMLOG export did not confirm")
+	}
+	// Anything OpsLog stamped before that export existed keeps counting.
+	old := &qso.QSO{Extras: map[string]string{"APP_OPSLOG_HAMLOG_QSL": "Y"}}
+	if !Confirmed(old, def, def.Confirm) {
+		t.Error("a QSO stamped with the older key stopped counting")
+	}
+}