fix: App crashes on uploading an image containing "+" in its name

as we're dealing with local file URLs only here, we don't want to turn
the plus signs (`+`) into spaces (leads to failing to open the file,
emits an exception, crashes later on in our JS code)

Fixes #9538

src/app/global/utils.nim

@@ -22,7 +22,7 @@ QtObject:
     result.setup
 
   proc formatImagePath*(self: Utils, imagePath: string): string =
-    result = uri.decodeUrl(replace(imagePath, "file://", ""))
+    result = uri.decodeUrl(replace(imagePath, "file://", ""), decodePlus=false)
     if defined(windows):
       # Windows doesn't work with paths starting with a slash
       result.removePrefix('/')

ui/imports/shared/status/StatusChatImageSizeValidator.qml

@@ -1,10 +1,6 @@
 import QtQuick 2.13
-import QtQuick.Controls 2.13
-import QtQuick.Layouts 1.13
-import QtGraphicalEffects 1.0
 
 import utils 1.0
-import ".."
 
 StatusChatImageValidator {
     id: root