Qt: Changing Cheevos URL color

At the moment it uses a dark blue color which looks fine on light themes but hurts my eyes on the darker themes, reminds me of the old 1.6 console dark mode

Making it currently a bit lighter blue which should fit all the themes, in the future we could make it follow the link color.

pcsx2-qt/Settings/AchievementSettingsWidget.ui

@@ -150,7 +150,7 @@
    <item>
     <widget class="QLabel" name="label">
      <property name="text">
-      <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p align=&quot;justify&quot;&gt;PCSX2 uses RetroAchievements as an achievement database and for tracking progress. To use achievements, please sign up for an account at &lt;a href=&quot;https://retroachievements.org/&quot;&gt;&lt;span style=&quot; text-decoration: underline; color:#0000ff;&quot;&gt;retroachievements.org&lt;/span&gt;&lt;/a&gt;.&lt;/p&gt;&lt;p align=&quot;justify&quot;&gt;To view the achievement list in-game, press the hotkey for &lt;span style=&quot; font-weight:600;&quot;&gt;Open Pause Menu&lt;/span&gt; and select &lt;span style=&quot; font-weight:600;&quot;&gt;Achievements&lt;/span&gt; from the menu.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+      <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p align=&quot;justify&quot;&gt;PCSX2 uses RetroAchievements as an achievement database and for tracking progress. To use achievements, please sign up for an account at &lt;a href=&quot;https://retroachievements.org/&quot;&gt;&lt;span style=&quot; text-decoration: underline; color:#4169e1;&quot;&gt;retroachievements.org&lt;/span&gt;&lt;/a&gt;.&lt;/p&gt;&lt;p align=&quot;justify&quot;&gt;To view the achievement list in-game, press the hotkey for &lt;span style=&quot; font-weight:600;&quot;&gt;Open Pause Menu&lt;/span&gt; and select &lt;span style=&quot; font-weight:600;&quot;&gt;Achievements&lt;/span&gt; from the menu.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
      </property>
      <property name="textFormat">
       <enum>Qt::RichText</enum>