Do not truncate command table

Temporary fix for commands not showing up if they
are missing a description. This is really a bug in the table
rendering and should be fixed there at some point.

Closes #192

src/Spectre.Console.Tests/Expectations/CommandAppTests.Help.Help.Should_Not_Show_Truncated_Command_Table_If_Commands_Are_Missing_Description.verified.txt

@@ -0,0 +1,9 @@
+USAGE:
+    myapp [OPTIONS] <COMMAND>
+
+OPTIONS:
+    -h, --help       Prints help information
+    -v, --version    Prints version information
+
+COMMANDS:
+    bar