themes: use only 1px for the focus border

The focus border looks better in more configuration as a nice
subtle 1px border.

Suggested-by: Mariusz Jaskółka <mar.jaskolka@gmail.com>
Signed-off-by: David Aguilar <davvid@gmail.com>

Author: davvid

cola/themes.py

@@ -173,7 +173,7 @@ def style_sheet_flat(self):
             /* Focused widths get a thin border */
             QTreeView:focus, QListView:focus,
             QLineEdit:focus, QTextEdit:focus, QPlainTextEdit:focus {
-                border-width: 2px;
+                border-width: 1px;
                 border-style: solid;
                 border-color: %(focus)s;
             }