Don't use failure location in failed example block output

This is problematic, since the failure could have ocurred outside the 
example block (in a method call).
The comment line under the failure details will still point to the 
result location, if it's available.

src/spectator/formatting/components/example_command.cr

@@ -1,14 +1,11 @@
 require "../../example"
-require "../../location"
 require "./comment"
 
 module Spectator::Formatting::Components
   # Provides syntax for running a specific example from the command-line.
   struct ExampleCommand
     # Creates the component with the specified example.
-    # The location can be overridden, for instance, pointing to a problematic line in the example.
-    # Otherwise the example's location is used.
-    def initialize(@example : Example, @location : Location? = nil)
+    def initialize(@example : Example)
     end
 
     # Produces output for running the previously specified example.
@@ -17,7 +14,7 @@ module Spectator::Formatting::Components
 
       # Use location for argument if it's available, since it's simpler.
       # Otherwise, use the example name filter argument.
-      if location = (@location || @example.location?)
+      if location = @example.location?
         io << location
       else
         io << "-e " << @example

src/spectator/formatting/components/failure_command_list.cr

@@ -14,12 +14,7 @@ module Spectator::Formatting::Components
       io.puts "Failed examples:"
       io.puts
       @failures.each do |failure|
-        # Use failed location if it's available.
-        if (result = failure.result).responds_to?(:location)
-          location = result.location
-        end
-
-        io.puts ExampleCommand.new(failure, location).colorize(:red)
+        io.puts ExampleCommand.new(failure).colorize(:red)
       end
     end
   end

src/spectator/formatting/components/result_block.cr

@@ -68,7 +68,8 @@ module Spectator::Formatting::Components
       end
     end
 
-    # Produces the (example) location line.
+    # Produces the location line.
+    # This is where the result was determined.
     private def location_line(io)
       location = if (result = @example.result).responds_to?(:location)
                    result.location