Fix command parsing bug when commenting after a command

When a comment was present directly on the same line after a command,
we did not correctly see the command as terminated and would join
continue parsing the next line.

src/command_manager.cc

@@ -193,8 +193,8 @@ void skip_blanks_and_comments(Reader& reader)
             ++(++reader);
         else if (c == '#')
         {
-            for (bool eol = false; reader and not eol; ++reader)
+            while (reader and *reader != '\n')
-                eol = *reader == '\n';
+                ++reader;
         }
         else
             break;

test/regression/0-comment-after-command/cmd

@@ -0,0 +1 @@
+:my-command<ret>

test/regression/0-comment-after-command/in

@@ -0,0 +1 @@
+

test/regression/0-comment-after-command/out

@@ -0,0 +1 @@
+foo

test/regression/0-comment-after-command/rc

@@ -0,0 +1,5 @@
+def my-command %{
+    buffer-next # go to next
+    %sh{ echo buffer-previous }
+    exec ifoo<esc>
+}