Filtering doesn't work when one of the words is "log"

#### To report a bug...

* What command(s) did you run?
`task "rc.json.array=on" "rc.report.next.filter=daily log" "export" "next"`
* What did you expect to happen?
Show me a list of tasks that have the string "daily log" on them
* What actually happened?
I got the following error: `Mismatched parentheses in expression`. If `rc.report.next.filter=log`, i.e. only the "log" word, the error is: "The expression could not be evaluated."

* Paste the output of the ```task diag``` command.
```
task 2.6.1
Platform: Linux

Compiler
Version: 11.2.0
Caps: +stdc +stdc_hosted +LP64 +c8 +i32 +l64 +vp64 +time_t64
Compliance: C++17

Build Features
CMake: 3.18.4
libuuid: libuuid + uuid_unparse_lower
libgnutls: 3.7.1
Build type: release

Configuration
File: /home/petemir/.taskrc (found), 2417 bytes, mode 100664
Data: /home/petemir/.task (found), dir, mode 40755
Locking: Enabled
GC: Enabled
$VISUAL: vim
Server: inthe.am:53589
CA: /home/petemir/Projects/automation/computer/twarrior/inthe.am/ca.cert.pem, readable, 2405 bytes
Certificate: /home/petemir/Projects/automation/computer/twarrior/inthe.am/private.certificate.pem, readable, 2710 bytes
Key: /home/petemir/Projects/automation/computer/twarrior/inthe.am/private.key.pem, readable, 17764 bytes
Trust: ignore hostname
Ciphers: NORMAL
Creds: inthe_am/matiaslaporte/************************************

Hooks
System: Enabled
Location: /home/petemir/.task/hooks
Active: on-modify.timewarrior (executable)
Inactive:

Tests
Terminal: 322x33
Dups: Scanned 591 tasks for duplicate UUIDs:
No duplicates found
Broken ref: Scanned 591 tasks for broken references:
No broken references found
```