[Kickoff] Don't capitalize full word sections

BUG: 433574
FIXED-IN: 5.21.1

(cherry picked from commit 1b3383ee)

applets/kickoff/package/contents/ui/SectionDelegate.qml

@@ -42,7 +42,8 @@ Item {
         level: 4
         // Force it to be uppercase or else if the first item in a section starts
         // with a lowercase letter, the header letter will be lowercase too!
-        text: section.toUpperCase()
+        // Only applies to alphabetical characters in "All applications"
+        text: section.length == 1 ? section.toUpperCase() : section
     }
     Item {
         width: parent.width