Remove orphaned TestFormatDependencyType test

The formatDependencyType function was removed in commit 57b6ea6 when
the dependency display UI was simplified. The test was left behind
and is now failing CI.

This completes the cleanup that was partially done in PR #309.

cmd/bd/show_test.go

@@ -1,30 +0,0 @@
-package main
-
-import (
-	"testing"
-
-	"github.com/steveyegge/beads/internal/types"
-)
-
-func TestFormatDependencyType(t *testing.T) {
-	tests := []struct {
-		name     string
-		depType  types.DependencyType
-		expected string
-	}{
-		{"blocks", types.DepBlocks, "blocks"},
-		{"related", types.DepRelated, "related"},
-		{"parent-child", types.DepParentChild, "parent-child"},
-		{"discovered-from", types.DepDiscoveredFrom, "discovered-from"},
-		{"unknown", types.DependencyType("unknown"), "unknown"},
-	}
-
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			result := formatDependencyType(tt.depType)
-			if result != tt.expected {
-				t.Errorf("formatDependencyType(%v) = %v, want %v", tt.depType, result, tt.expected)
-			}
-		})
-	}
-}