[mod] add option max_page to bing, brave, qwant, startpage & mojeek

[1] https://github.com/searxng/searxng/issues/2982#issuecomment-1808975780

Reported-by: @Damaj301damaj-lol [1]
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/settings.yml

@@ -1871,6 +1871,7 @@ engines:
     suggestion_xpath: //div[@class="top-info"]/p[@class="top-info spell"]/em/a
     first_page_num: 0
     page_size: 10
+    max_page: 100
     disabled: true
     about:
       website: https://www.mojeek.com/