Aligned verbose message output of tasks with normal task output.

I.e. removed the colon after the ITEM#. Updated tasks are now listed like the 'todo.sh ls' command does, e.g.
    42 smell the roses
This is in preparation to eventually use a function factored out from _list() for the verbose task output, which would enable coloring in the verbose message and thus align the verbose message output even more with the normal task output.

tests/t1800-del.sh

@@ -34,7 +34,7 @@ test_todo_session 'basic del' <<EOF
 TODO: 3 of 3 tasks shown
 
 >>> todo.sh -f del 1
-1: (B) smell the uppercase Roses +flowers @outside
+1 (B) smell the uppercase Roses +flowers @outside
 TODO: 1 deleted.
 
 >>> todo.sh -p list
@@ -51,7 +51,7 @@ stop
 EOF
 test_todo_session 'del preserving line numbers' <<EOF
 >>> todo.sh -f del 1
-1: (B) smell the uppercase Roses +flowers @outside
+1 (B) smell the uppercase Roses +flowers @outside
 TODO: 1 deleted.
 
 >>> todo.sh -f del 1
@@ -59,7 +59,7 @@ TODO: 1 deleted.
 === 1
 
 >>> todo.sh add A new task
-4: A new task
+4 A new task
 TODO: 4 added.
 
 >>> todo.sh -p list
@@ -70,11 +70,11 @@ TODO: 4 added.
 TODO: 3 of 3 tasks shown
 
 >>> todo.sh -f -n del 2
-2: (A) notice the sunflowers
+2 (A) notice the sunflowers
 TODO: 2 deleted.
 
 >>> todo.sh add Another new task
-3: Another new task
+3 Another new task
 TODO: 3 added.
 
 >>> todo.sh -p list
@@ -99,9 +99,9 @@ test_todo_session 'basic del TERM' <<EOF
 TODO: 3 of 3 tasks shown
 
 >>> todo.sh del 1 uppercase
-1: (B) smell the uppercase Roses +flowers @outside
+1 (B) smell the uppercase Roses +flowers @outside
 TODO: Removed 'uppercase' from task.
-1: (B) smell the Roses +flowers @outside
+1 (B) smell the Roses +flowers @outside
 
 >>> todo.sh -p list
 2 (A) notice the sunflowers
@@ -111,24 +111,24 @@ TODO: Removed 'uppercase' from task.
 TODO: 3 of 3 tasks shown
 
 >>> todo.sh del 1 "the Roses"
-1: (B) smell the Roses +flowers @outside
+1 (B) smell the Roses +flowers @outside
 TODO: Removed 'the Roses' from task.
-1: (B) smell +flowers @outside
+1 (B) smell +flowers @outside
 
 >>> todo.sh del 1 m
-1: (B) smell +flowers @outside
+1 (B) smell +flowers @outside
 TODO: Removed 'm' from task.
-1: (B) sell +flowers @outside
+1 (B) sell +flowers @outside
 
 >>> todo.sh del 1 @outside
-1: (B) sell +flowers @outside
+1 (B) sell +flowers @outside
 TODO: Removed '@outside' from task.
-1: (B) sell +flowers
+1 (B) sell +flowers
 
 >>> todo.sh del 1 sell
-1: (B) sell +flowers
+1 (B) sell +flowers
 TODO: Removed 'sell' from task.
-1: (B) +flowers
+1 (B) +flowers
 EOF
 
 cat > todo.txt <<EOF
@@ -138,7 +138,7 @@ cat > todo.txt <<EOF
 EOF
 test_todo_session 'del nonexistant TERM' <<EOF
 >>> todo.sh del 1 dung
-1: (B) smell the uppercase Roses +flowers @outside
+1 (B) smell the uppercase Roses +flowers @outside
 TODO: 'dung' not found; no removal done.
 === 1