feat(lookup): optional QRZ nickname as the logged name

QRZ publishes <nickname> — the name an operator goes BY on the air — and
OpsLog was composing fname + name instead. "Bob" is what belongs in a log;
"Robert J Smith" is what belongs on a licence.

QRZ only, and deliberately so: HamQTH's <nick> already fills the Name field
that way, so the same switch there would toggle a behaviour it has no way to
turn off.

A published nickname is optional, so an empty one falls through to the
registered name. That is the whole point of it being a fallback rather than a
swap, and it is what the test pins — a blank nickname must never blank the
name.

internal/lookup/normalize_test.go

@@ -4,14 +4,14 @@ import "testing"
 
 func TestTitleCase(t *testing.T) {
 	cases := map[string]string{
-		"NOEL CHENAVARD":     "Noel Chenavard",
-		"VETRAZ-MONTHOUX":    "Vetraz-Monthoux",
-		"o'brien":            "O'Brien",
+		"NOEL CHENAVARD":        "Noel Chenavard",
+		"VETRAZ-MONTHOUX":       "Vetraz-Monthoux",
+		"o'brien":               "O'Brien",
 		"866 ROUTE DES VOIRONS": "866 Route Des Voirons",
-		"PARIS":              "Paris",
-		"":                   "",
-		"  saint-étienne  ":  "Saint-Étienne",
-		"JOHN":               "John",
+		"PARIS":                 "Paris",
+		"":                      "",
+		"  saint-étienne  ":     "Saint-Étienne",
+		"JOHN":                  "John",
 	}
 	for in, want := range cases {
 		if got := titleCase(in); got != want {