DisplayOptions: flip function bar buttons to Dec and Inc

as per @Explorer09's suggestion in #745.

Also makes it consistent with "- Nice" and "+ Nice" in
the main function bar!

DisplayOptionsPanel.c

@@ -24,14 +24,14 @@ in the source distribution for its full text.
 
 static const char* const DisplayOptionsFunctions[] = {"      ", "      ", "      ", "      ", "      ", "      ", "      ", "      ", "      ", "Done  ", NULL};
 
-static const char* const DisplayOptionsIncDecFunctions[] = {"Inc   ", "Dec   ", "                                                      ", "Done  ", NULL};
-static const char* const DisplayOptionsIncDecKeys[] = {"+ ", "- ", "  ", "F10", NULL};
-static const int DisplayOptionsIncDecEvents[] = {'+', '-', ERR, KEY_F(10)};
+static const char* const DisplayOptionsDecIncFunctions[] = {"Dec   ", "Inc   ", "                                                      ", "Done  ", NULL};
+static const char* const DisplayOptionsDecIncKeys[] = {"- ", "+ ", "  ", "F10", NULL};
+static const int DisplayOptionsDecIncEvents[] = {'-', '+', ERR, KEY_F(10)};
 
 static void DisplayOptionsPanel_delete(Object* object) {
    Panel* super = (Panel*) object;
    DisplayOptionsPanel* this = (DisplayOptionsPanel*) object;
-   FunctionBar_delete(this->incDecBar);
+   FunctionBar_delete(this->decIncBar);
    Panel_done(super);
    free(this);
 }
@@ -95,7 +95,7 @@ static HandlerResult DisplayOptionsPanel_eventHandler(Panel* super, int ch) {
          /* fallthrough */
       case EVENT_SET_SELECTED:
          if (OptionItem_kind(selected) == OPTION_ITEM_NUMBER) {
-            super->currentBar = this->incDecBar;
+            super->currentBar = this->decIncBar;
          } else {
             Panel_setDefaultBar(super);
          }
@@ -131,7 +131,7 @@ DisplayOptionsPanel* DisplayOptionsPanel_new(Settings* settings, ScreenManager*
    FunctionBar* fuBar = FunctionBar_new(DisplayOptionsFunctions, NULL, NULL);
    Panel_init(super, 1, 1, 1, 1, Class(OptionItem), true, fuBar);
 
-   this->incDecBar = FunctionBar_new(DisplayOptionsIncDecFunctions, DisplayOptionsIncDecKeys, DisplayOptionsIncDecEvents);
+   this->decIncBar = FunctionBar_new(DisplayOptionsDecIncFunctions, DisplayOptionsDecIncKeys, DisplayOptionsDecIncEvents);
    this->settings = settings;
    this->scr = scr;
 

DisplayOptionsPanel.h

@@ -18,7 +18,7 @@ typedef struct DisplayOptionsPanel_ {
 
    Settings* settings;
    ScreenManager* scr;
-   FunctionBar* incDecBar;
+   FunctionBar* decIncBar;
 } DisplayOptionsPanel;
 
 extern const PanelClass DisplayOptionsPanel_class;