demos: changes related to the new default log revset

We remove some branches that would be shown by default and
remove `-r 'all()'` where it's no longer necessary.

demos/demo_operation_log.sh

@@ -3,8 +3,12 @@ set -euo pipefail
 . "$(dirname "$0")"/helpers.sh
 
 new_tmp_dir
-jj git clone https://github.com/octocat/Hello-World > /dev/null
-cd Hello-World
+{
+    jj git clone https://github.com/octocat/Hello-World
+    cd Hello-World
+    jj abandon octocat-patch-1
+    jj branch forget octocat-patch-1
+} > /dev/null
 
 comment "We are in the octocat/Hello-World repo.
 The \"operation log\" shows the operations

demos/demo_resolve_conflicts.sh

@@ -3,12 +3,16 @@ set -euo pipefail
 . "$(dirname "$0")"/helpers.sh
 
 new_tmp_dir
-jj git clone https://github.com/octocat/Hello-World > /dev/null
-cd Hello-World
+{
+    jj git clone https://github.com/octocat/Hello-World 
+    cd Hello-World
+    jj abandon test
+    jj branch forget test
+} > /dev/null
 
 comment "We are on the master branch of the
 octocat/Hello-World repo:"
-run_command "jj log -r 'all()'"
+run_command "jj log"
 
 comment "Let's make an edit that will conflict
 when we rebase it:"
@@ -29,7 +33,7 @@ run_command "jj rebase -d b1"
 
 comment "That seemed to succeed but we are also told there is now a conflict.
 Let's take a look at the repo:"
-run_command "jj log -r 'all()'"
+run_command "jj log"
 run_command "jj status"
 
 comment "Indeed, the rebased commit has a conflict. The conflicted file

demos/demo_working_copy.sh

@@ -3,8 +3,14 @@ set -euo pipefail
 . "$(dirname "$0")"/helpers.sh
 
 new_tmp_dir
-jj git clone https://github.com/octocat/Hello-World > /dev/null
-cd Hello-World
+{
+    jj git clone https://github.com/octocat/Hello-World
+    cd Hello-World
+    jj abandon test
+    jj branch forget test
+    jj abandon octocat-patch-1
+    jj branch forget octocat-patch-1
+}> /dev/null
 
 comment "We are in the octocat/Hello-World repo.
 We have an empty working copy on top of master:"