remove a comma that shouldn't be there from an installer screen

mail/installer/windows/install.it

@@ -54,7 +54,7 @@ DOWNLOADSIZE=Download Size: %u KB
 CURRENTSETTINGS=Current Settings:
 INSTALLFOLDER=...to the following location:
 ADDTLCOMPWRAPPER=- %s
-PRIMCOMPOTHERS=%s, and:
+PRIMCOMPOTHERS=%s and:
 PRIMCOMPNOOTHERS=%s
 INSTALL_=&Install
 DELETE_=&Delete