Remove unused variable "saved_opts".

wattr_get is a macro, and the documentation states:
"The parameter opts is reserved for  future use,
applications must supply a null pointer."

In practice, passing a variable there is harmless, except
that it is unused inside the macro, which causes unused
variable warnings.

The various places where

Author: Sterling-Augustine

lldb/source/Core/IOHandlerCursesGUI.cpp

@@ -485,8 +485,7 @@ class Window {
                                     bool use_blue_background) {
     attr_t saved_attr;
     short saved_pair;
-    int saved_opts;
-    wattr_get(m_window, &saved_attr, &saved_pair, &saved_opts);
+    wattr_get(m_window, &saved_attr, &saved_pair, nullptr);
     if (use_blue_background)
       ::wattron(m_window, COLOR_PAIR(WhiteOnBlue));
     while (!string.empty()) {
@@ -522,7 +521,7 @@ class Window {
         continue;
       }
       if (value == 0) { // Reset.
-        wattr_set(m_window, saved_attr, saved_pair, &saved_opts);
+        wattr_set(m_window, saved_attr, saved_pair, nullptr);
         if (use_blue_background)
           ::wattron(m_window, COLOR_PAIR(WhiteOnBlue));
       } else {
@@ -531,7 +530,7 @@ class Window {
                   COLOR_PAIR(value - 30 + 1 + (use_blue_background ? 8 : 0)));
       }
     }
-    wattr_set(m_window, saved_attr, saved_pair, &saved_opts);
+    wattr_set(m_window, saved_attr, saved_pair, nullptr);
   }
 
   void Touch() {