Update jetbrains.conf to capture find windows with singular space title (#4909)

Some find windows like "find everywhere" has initial title that consists of a singular space. Update title matching expression to capture that case as well.

default/hypr/apps/jetbrains.conf

@@ -14,7 +14,7 @@ windowrule {
 windowrule {
     name = jetbrains-popup
     match:class = ^(jetbrains-.*)
-    match:title = ^()$
+    match:title = ^(| )$
     match:float = 1
     tag = +jetbrains
     center = on