Apply suggestions from code review

Co-authored-by: yoff <lerchedahl@gmail.com>

Author: jorgectf

python/ql/src/experimental/semmle/python/frameworks/Django.qll

@@ -190,7 +190,7 @@ private module ExperimentalPrivateDjango {
       }
     }
 
-    module email {
+    module Email {
       /** https://docs.djangoproject.com/en/3.2/topics/email/ */
       private API::Node djangoMail() {
         result = API::moduleImport("django").getMember("core").getMember("mail")

python/ql/src/experimental/semmle/python/frameworks/Sendgrid.qll

@@ -20,8 +20,6 @@ private module Sendgrid {
   /** Gets a reference to `sendgrid.helpers.mail.Mail` */
   private API::Node sendgridMailInstance() { result = sendgridMailHelper().getMember("Mail") }
 
-  /** Gets a call to `sendgrid.helpers.mail.Mail()`. */
-  private DataFlow::CallCfgNode sendgridMailCall() { result = sendgridMailInstance().getACall() }
 
   /** Gets a reference to a `SendGridAPIClient` instance. */
   private API::Node sendgridApiClient() {
@@ -137,7 +135,7 @@ private module Sendgrid {
       or
       exists(KeyValuePair footer, Dict generalDict, KeyValuePair enablePair, KeyValuePair htmlPair |
         footer.getKey().(StrConst).getText() = ["footer", "subscription_tracking"] and
-        footer.getValue().(Dict) = generalDict and
+        footer.getValue() = generalDict and
         // check footer is enabled
         enablePair.getKey().(StrConst).getText() = "enable" and
         exists(enablePair.getValue().(True)) and

python/ql/src/experimental/semmle/python/libraries/FlaskMail.qll

@@ -18,8 +18,6 @@ private module FlaskMail {
   /** Gets a reference to `flask_mail.Mail()`, `flask_sendmail.Mail()` and `flask.ext.sendmail.Mail()`. */
   private API::Node flaskMailInstance() { result = flaskMail().getMember("Mail").getReturn() }
 
-  /** Gets a reference to `flask_mail.Message`, `flask_sendmail.Message` and `flask.ext.sendmail.Message`. */
-  private API::Node flaskMessageInstance() { result = flaskMail().getMember("Message") }
 
   /**
    * Gets a call to `mail.send()`.