fix a bug with search and space replacement

[manivoxel51]

What changes are proposed in this pull request?

noticed that all spaces should not be removed so we can support multi-word search ex: "description:bad annotations"
solution is to trim() instead

How is this patch tested? If it is not, please explain why.

(Details)

Release Notes

Is this a user-facing change that should be mentioned in the release notes?

• No. You can skip the rest of this section.
• Yes. Give a description of this change to be included in the release
  notes for FiftyOne users.

(Details in 1-2 sentences. You can just refer to another PR with a description
if this PR is part of a larger change.)

What areas of FiftyOne does this PR affect?

• App: FiftyOne application changes
• Build: Build and test infrastructure changes
• Core: Core fiftyone Python library changes
• Documentation: FiftyOne documentation changes
• Other

[lanzhenw]

LGTM

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (d335adb) 62.65% compared to head (d81747a) 62.65%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2975   +/-   ##
========================================
  Coverage    62.65%   62.65%           
========================================
  Files          270      270           
  Lines        46060    46060           
  Branches       362      362           
========================================
  Hits         28860    28860           
  Misses       17200    17200           

Flag	Coverage Δ
app	49.78% <ø> (ø)
python	99.44% <ø> (ø)

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