fix(install): make Enterprise startup options 2 and 3 reachable (#27363)

The Enterprise startup case statement used `1|*)` as its first arm,
which matches any input because `*` is a wildcard. This made options
`2` (Custom Configuration) and `3` (Skip startup) unreachable — every
non-`1` input fell into the first arm and printed "Invalid choice".

Split the pattern into separate `1)` and `*)` arms, matching the Core
block's structure.

Author: hiltontj

install_influxdb.sh

@@ -1437,11 +1437,8 @@ else
     STARTUP_CHOICE=${STARTUP_CHOICE:-1}
 
     case "$STARTUP_CHOICE" in
-        1|*)
+        1)
             # Quick Start - use defaults and check for existing license
-            if [ "$STARTUP_CHOICE" != "1" ]; then
-                printf "Invalid choice. Using Quick Start (option 1).\n"
-            fi
             setup_quick_start_defaults enterprise
             setup_license_for_quick_start
             START_SERVICE="y"
@@ -1454,6 +1451,12 @@ else
             # Skip startup
             START_SERVICE="n"
             ;;
+        *)
+            printf "Invalid choice. Using Quick Start (option 1).\n"
+            setup_quick_start_defaults enterprise
+            setup_license_for_quick_start
+            START_SERVICE="y"
+            ;;
     esac
 
     if [ "$START_SERVICE" = "y" ] && [ "$STARTUP_CHOICE" = "1" ]; then