LibLine: Do not ignore ^C and do not finish() after interrupt

Author: https://github.com/alimpfard
Commit: 1a7af4d677
Pull-request: https://github.com/SerenityOS/serenity/pull/1916

Libraries/LibLine/Editor.cpp

@@ -152,6 +152,10 @@ String Editor::get_line(const String& prompt)
                     if (m_was_resized)
                         continue;
 
+                    finish();
+                    continue;
+                }
+
                 m_was_interrupted = false;
 
                 if (!m_buffer.is_empty())
@@ -159,9 +163,7 @@ String Editor::get_line(const String& prompt)
 
                 m_buffer.clear();
                 m_cursor = 0;
-                }
+                m_refresh_needed = true;
-
-                finish();
                 continue;
             }
             perror("read failed");