Fix invalid warning log causing FORMATTER CRASH

[hoyon]

When this warning is triggered due to opentelemetry_exporter not being installed, the warning causes a formatter crash error as below.

This is because format args are supplied but are not used in the format string.

2024-09-23T16:40:10.836262+01:00 warning: FORMATTER CRASH: {"OTLP exporter module `opentelemetry_exporter` not found. Verify you have included the `opentelemetry_exporter` dependency.",[opentelemetry_exporter]}

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 73.19%. Comparing base (f80cd08) to head (bda6844).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
apps/opentelemetry/src/otel_exporter.erl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #774   +/-   ##
=======================================
  Coverage   73.19%   73.19%           
=======================================
  Files          64       64           
  Lines        1940     1940           
=======================================
  Hits         1420     1420           
  Misses        520      520           

Flag	Coverage Δ
api	69.90% <ø> (ø)
elixir	17.32% <ø> (ø)
erlang	74.51% <0.00%> (ø)
exporter	73.06% <ø> (ø)
sdk	77.30% <0.00%> (ø)
zipkin	54.16% <ø> (ø)

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