db/{Count,Print}: use tag_print(), eliminate duplicate code

src/TagPrint.cxx

@@ -41,7 +41,7 @@ void
 tag_print_values(Response &r, const Tag &tag)
 {
 	for (const auto &i : tag)
-		r.Format("%s: %s\n", tag_item_names[i.type], i.value);
+		tag_print(r, i.type, i.value);
 }
 
 void

src/db/Count.cxx

@@ -25,6 +25,7 @@
 #include "client/Response.hxx"
 #include "LightSong.hxx"
 #include "tag/Tag.hxx"
+#include "TagPrint.hxx"
 
 #include <functional>
 #include <map>
@@ -57,7 +58,7 @@ Print(Response &r, TagType group, const TagCountMap &m)
 	assert(unsigned(group) < TAG_NUM_OF_ITEM_TYPES);
 
 	for (const auto &i : m) {
-		r.Format("%s: %s\n", tag_item_names[group], i.first.c_str());
+		tag_print(r, group, i.first.c_str());
 		PrintSearchStats(r, i.second);
 	}
 }

src/db/DatabasePrint.cxx

@@ -23,6 +23,7 @@
 #include "SongFilter.hxx"
 #include "SongPrint.hxx"
 #include "TimePrint.hxx"
+#include "TagPrint.hxx"
 #include "client/Response.hxx"
 #include "Partition.hxx"
 #include "tag/Tag.hxx"
@@ -192,12 +193,11 @@ PrintUniqueTag(Response &r, TagType tag_type,
 {
 	const char *value = tag.GetValue(tag_type);
 	assert(value != nullptr);
-	r.Format("%s: %s\n", tag_item_names[tag_type], value);
+	tag_print(r, tag_type, value);
 
 	for (const auto &item : tag)
 		if (item.type != tag_type)
-			r.Format("%s: %s\n",
-				 tag_item_names[item.type], item.value);
+			tag_print(r, item.type, item.value);
 }
 
 void