Everywhere: It's now "Foobar", not "FooBar", and not "foo bar"

I hereby declare these to be full nouns that we don't split,
neither by space, nor by underscore:

- Breadcrumbbar
- Coolbar
- Menubar
- Progressbar
- Scrollbar
- Statusbar
- Taskbar
- Toolbar

This patch makes everything consistent by replacing every other variant
of these with the proper one. :^)

Userland/Applications/FileManager/FileOperationProgress.gml

@@ -36,9 +36,9 @@
         }
     }
 
-    @GUI::ProgressBar {
+    @GUI::Progressbar {
         fixed_height: 22
-        name: "current_file_progress_bar"
+        name: "current_file_progressbar"
         min: 0
     }
 
@@ -62,9 +62,9 @@
         }
     }
 
-    @GUI::ProgressBar {
+    @GUI::Progressbar {
         fixed_height: 22
-        name: "overall_progress_bar"
+        name: "overall_progressbar"
         min: 0
     }