chore: remove unnecessary go mod tidy (#2537)

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## Overview

The makefile target is already depending on `mod` before building the
binary. Thus, we can remove the extra go mod tidy

## Checklist

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- [ ] New and updated code has appropriate documentation
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(cherry picked from commit d51e01a)

Makefile

@@ -63,7 +63,6 @@ build: mod
 	@cd ./cmd/celestia-appd
 	@mkdir -p build/
 	@go build $(BUILD_FLAGS) -o build/ ./cmd/celestia-appd
-	@go mod tidy
 .PHONY: build
 
 ## install: Build and install the celestia-appd binary into the $GOPATH/bin directory.