Fix Markdown Code Block Delimiter Visibility

Change the foreground color of code block tags (triple backticks) and inline
backticks from keyword and string colors to the default background color,
effectively hiding these delimiters while preserving the styled code content.

** Generated by CodeLite. **

Signed-off-by: Eran Ifrah <eran@codelite.org>

Author: eranif

Plugin/MarkdownStyler.cpp

@@ -187,8 +187,8 @@ void MarkdownStyler::InitStyles()
 
     m_ctrl->StyleSetForeground(MarkdownStyles::kHorizontalLine, block_comment.GetFgColour());
 
-    m_ctrl->StyleSetForeground(MarkdownStyles::kCodeBlockTag, keyword.GetFgColour());
-    m_ctrl->StyleSetForeground(MarkdownStyles::kBacktick, string.GetFgColour());
+    m_ctrl->StyleSetForeground(MarkdownStyles::kCodeBlockTag, default_bg);
+    m_ctrl->StyleSetForeground(MarkdownStyles::kBacktick, default_bg);
 
     m_ctrl->StyleSetEOLFilled(MarkdownStyles::kCodeBlockText, true);
     m_ctrl->StyleSetBackground(MarkdownStyles::kCodeBlockText, code_bg);