Interpreter: reset split_result after processing it

This fixes e.g.:

    <pragma-> ,{echo foo ;;; echo bar}  ,{echo baz}
       <PBot> foo bar
       <PBot> foo baz

To instead produce the expected:

    <PBot> foo bar
    <PBot> baz

lib/PBot/Core/Interpreter.pm

@@ -697,6 +697,7 @@ sub handle_result($self, $context, $result = $context->{result}) {
         $result =~ s!^/me !\n* $botnick !i;
 
         $result = $context->{split_result} . $result;
+        delete $context->{split_result};
     }
 
     # nothing more to do here if we have no result or keyword

lib/PBot/VERSION.pm

@@ -25,8 +25,8 @@ use PBot::Imports;
 # These are set by the /misc/update_version script
 use constant {
     BUILD_NAME     => "PBot",
-    BUILD_REVISION => 4847,
-    BUILD_DATE     => "2024-11-09",
+    BUILD_REVISION => 4849,
+    BUILD_DATE     => "2024-11-10",
 };
 
 sub initialize {}