Set SUFeedURL in Info.plist. Sometimes Sparkle doesn't see the user defaults...

Set SUFeedURL in Info.plist. Sometimes Sparkle doesn't see the user defaults key and then dies because it lacks a URL. The down side of this is that beta users may not pull from the beta track and the experiment bucket will get more than its fair share of requests on the stable track. But it beats the heck out of crashing for no reason.

Analysis here:

https://github.com/sparkle-project/Sparkle/issues/1139

plists/iTerm2.plist

@@ -240,5 +240,7 @@
 	<string>https://iterm2.com/appcasts/testing.xml</string>
 	<key>SUFeedURLForFinal</key>
 	<string>https://iterm2.com/appcasts/final.xml</string>
+        <key>SUFeedURL</key>
+        <string>https://iterm2.com/appcasts/final.xml</string>
 </dict>
 </plist>

plists/nightly-iTerm2.plist

@@ -240,5 +240,7 @@
 	<string>https://iterm2.com/appcasts/nightly.xml</string>
 	<key>SUFeedURLForFinal</key>
 	<string>https://iterm2.com/appcasts/final.xml</string>
+        <key>SUFeedURL</key>
+        <string>https://iterm2.com/appcasts/final.xml</string>
 </dict>
 </plist>

plists/preview-iTerm2.plist

@@ -240,5 +240,7 @@
 	<string>https://iterm2.com/appcasts/testing3.xml</string>
 	<key>SUFeedURLForFinal</key>
 	<string>https://iterm2.com/appcasts/final.xml</string>
+        <key>SUFeedURL</key>
+        <string>https://iterm2.com/appcasts/final.xml</string>
 </dict>
 </plist>

plists/release-iTerm2.plist

@@ -240,5 +240,7 @@
 	<string>https://iterm2.com/appcasts/testing.xml</string>
 	<key>SUFeedURLForFinal</key>
 	<string>https://iterm2.com/appcasts/final.xml</string>
+        <key>SUFeedURL</key>
+        <string>https://iterm2.com/appcasts/final.xml</string>
 </dict>
 </plist>