Vim: Ensure that every queries respect excluded tags

This makes sure that the bug solved by the previous commit won't happen again
and remove some dupplication.
This shouldn't have any side effect.

vim/notmuch.vim

@@ -317,9 +317,6 @@ ruby << EOF
 	$curbuf.render do |b|
 		q = $curbuf.query(get_cur_view)
 		q.sort = Notmuch::SORT_OLDEST_FIRST
-		$exclude_tags.each { |t|
-			q.add_tag_exclude(t)
-		}
 		msgs = q.search_messages
 		msgs.each do |msg|
 			m = Mail.read(msg.filename)
@@ -643,9 +640,6 @@ ruby << EOF
 			$searches.clear
 			folders.each do |name, search|
 				q = $curbuf.query(search)
-				$exclude_tags.each { |t|
-					q.add_tag_exclude(t)
-				}
 				$searches << search
 				count = count_threads ? q.count_threads : q.count_messages
 				b << "%9d %-20s (%s)" % [count, name, search]
@@ -657,9 +651,6 @@ ruby << EOF
 		date_fmt = VIM::evaluate('g:notmuch_date_format')
 		q = $curbuf.query(search)
 		q.sort = Notmuch::SORT_NEWEST_FIRST
-		$exclude_tags.each { |t|
-			q.add_tag_exclude(t)
-		}
 		$threads.clear
 		t = q.search_threads
 
@@ -711,6 +702,9 @@ ruby << EOF
 		def query(*args)
 			q = @db.query(*args)
 			@queries << q
+			$exclude_tags.each { |t|
+			    q.add_tag_exclude(t)
+			}
 			q
 		end